[求助]求助GWD语法题一道

17. GWD-26-Q17

Responding to the public’s fascination with-and sometimes
        undue alarm over-possible threats from asteroids, a scale
            developed by astronomers rates the likelihood that a particular asteroid or comet may collide with Earth.

A.      a scale developed by astronomers rates the likelihood
        that a particular asteroid or comet may

B.       a scale that astronomers have developed rates how
        likely it is for a particular asteroid or comet to

C.      astronomers have developed a scale to rate how likely
        a particular asteroid or comet will be to

D.      astronomers have developed a scale for rating the
        likelihood that a particular asteroid or comet will

E.       astronomers have developed a scale that rates the
        likelihood of a particular asteroid or comet that may

参考答案是C，但是觉得will be to 是不是有问题阿，请高手指点？

will be to没有错，是因为 asteroid or comet还没collide with the earth。

而且to rate也比for rating好。

谢谢，明白了