prep1-162，请问这是什么句子成分？

答案是A

A中的for引导的句子，是什么成分？

做题目的时候，认为它当插入语不合适，误选了B。

谁能帮忙解释一下呢？

谢谢

162。
             The
        government
        predicts
        that, for
            consumers
            and
            businesses
            that
            make
            a
            large
            number
            of
                long-distance
            calls, the
        Federal
        Communications
        Commission's
            recent
        telephone
        rate
        cuts
        will
        greatly
            reduce
        costs, though
            some
            consumer
            groups
            disagree
            with
            the
            government's
            estimates, suggesting
            they
            are
            too
            optimistic.

(A)
            The
            government
            predicts
            that, for
            consumers
            and
            businesses
            that
            make
            a
            large
            number
            of
            long-distance calls, the
            Federal
            Communications
            Commission's
            recent
            telephone
            rate
            cuts
            will
            greatly
            reduce
            costs

(B)
            The
            government
            predicts
            that
            costs
            will
            be
            greatly
            reduced for
            consumers
            and
            businesses
            that make
            a
        large
            number
            of
            long-distance
            calls
            by
            the
            Federal
            Communications
            Commission's
            recent
            telephone
            rate
            cuts

(C)
            The
            government's
            prediction/Idiom
            is, for
            consumers
            and
            businesses
            making
            a
            large
            number
            of
        long-distance
            calls, costs
            will
            be
            greatly
            reduced
            by
            the
            recent
            telephone rate
            cuts
            made
            by
            the
            Federal

Communications
            Commission

(D)
            For
            consumers
            and
            businesses
            that
            make
            a
            large
            number
            of
            long-distance
            calls, the
            government's preDiction/Idiom
            that
            the
            Federal
            Communications
            Commission's
            recent
            telephone
            rate
            cuts
            will
            greatly reduce
            costs

(E)
            For
            consumers
            and
            businesses
            making
            a
            large
            number
            of
            long-distance
            calls, the
            government
            predicts that
            the
            recent
            telephone
            rate
            cuts
            that
            the
            Federal
            Communications
            Commission
            has
            made
            will
            greatly reduce

就是插入语，B被动语态太罗嗦了，这里用for的整个句子结构比较清晰。

up!同错选B了，现在觉得

B  The
            government
            predicts
            that
            costs
            will
            be
            greatly
            reduced for
            consumers
            and
            businesses
            that make
            a
            large
            number
            of
            long-distance
            calls
            by
            the
            Federal
            Communications
            Commission's
            recent
            telephone
            rate
            cuts  最大的缺点就是句意模糊不清，容易产生make
            a
            large
                number
                of
                long-distance
                calls by
            the...的歧义，而不是costs
            will
            be
            greatly
            reduced .....by the...