OG 13-73 求解释啊！！

我是熊宝宝

73. Unlike the original National Museum of Science andTechnology in Italy, where the models are encased inglassor operated only bystaff members,the VirtualLeonardo 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

A选项，which引导定语从句，代表前面encourage那句话，这样不可以吗？
答案选D, encourage to 后面接两个并列动词，touch和activate

我是熊宝宝

谁来讲解下啊

Liz要回到那里

which引导定语从句不能指代一件事（那句话）
其他的定从也都不能指代一件事儿