GRE Big Book test 3 Section 5 q 5

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Here according to my understanding, I thought “which is -------, " is talking more about the entire first idea”
the opposition of good and evil is portrayed as a ------- between technology", but it is talking more only about technology(after I checked the answer key). How do I understand this?

“In science fiction films, the opposite of good and evil is portrayed as a I)--------- between technology”

This bit itself isn’t really an idea, so “which” cannot be referring to that, right?

Why isn’t it an idea?

Because “between technology” by itself doesn’t make sense right?