求教：GWD26-Q17 will be to与will区别？！

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.

答案是C，我一直徘徊在C和D之间，不知道为什么要用will be to， 牛人们可否解释一下？！

首先developed a scale后面就应该用to表示目的而不是for,后面的will be to其实是分开的，will be和前面的how likely a particular asteroid or comet相连,然后才是to collide with Earth

太牛了！一语道破天机！

谢谢楼上的牛牛！