快来帮我看看这道题

12. The Olympic Games helped to keep peace among the pugnacious states of the Greek world in that a sacred truce was proclaimed during the festival’s month. （c ）

(A) world in that a sacred truce was proclaimed during the festival’s month 。

(B) world, proclaiming a sacred truce during the festival’s month proclaiming

(C) world when they proclaimed a sacred truce for the festival month

(D) world, for a sacred truce was proclaimed during the month of the festival

(E) world by proclamation of a sacred truce that was for the month of the festival wordy.

答案C，they难道不会产生指代不明的问题吗？

D有什么不对的呢？用被动避免了该问题啊

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