GMAT Sentence Correction (SC) | Re: In the mid-1920s the Hawthorne Works of the Western Electric

Can someone help me quickly with B vs D? I read other comments and am still a little lost.

B) My problem with B is that I believe it is modifying "scene", which doesn't make sense. Both "of an intensive series" and "of experiments" are prepositional phrases and thus modifiers in their own right.

D) Some of the people above were saying that the reason D is wrong is because "that" shows the clause that follows is modifying experiment.How is modifying experiment