请教OG里面一道题

shemmiasun

Unlike the original National Museum of Science and Technology in Italy, where the models are encased in glass or operated only by staff members, the Virtual Leonardo Project, an online version of the museum, encourages visitors to “touch” each exhibit, whichthereby activates the animated functions of the piece.
(A) exhibit, which thereby activates
(B) exhibit, in turn an activation of
(C) exhibit, and it will activate
(D) exhibit and thereby activate
(E) exhibit which, as a result, activates

答案是D,我虽然选对了,但是对于OG的解释还是有不明白的地方.
OG上说, A错在which没有先行词,所以不清楚到底是什么activate the functions...可是这里的which不就是指代前面的exhibit吗？就是离它最近的名词。

请指教~~

maximeason

仅仅exhibit是不能做主语的 因为exhibit不能activate 而是  project  activates the functions