问一道英语语法题求解答啊!1.The comet has recently changed direction towa

问一道英语语法题求解答啊!
1.The comet has recently changed direction toward Jupiter,which is leading scientists to wonder about the composition of the object.
(A) which is leading scientists to wonder about
(B) this development leading scientists to wonder about
(C) and with it scientists’ wonder of
(D) a development leading scientists to wonder about
(E) this leading scientists to wonder on
只解释ABD就可以了.
为什么不选A B