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, which thereby 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
Can anybody explain how do we decide between activates/activate. What is the subject for this verb ?
Also, what is which refers to in option A ?