Query about Question 12 from "(GRE Big Book) Test 7 Text Completion Problems (14)" [9787]

GRE GRE Verbal Problem Solving
1

https://www.gregmat.com/quizzes/quiz/gre-big-book-test-7-text-completion-problems-14 (Question 12)

Why is option D (an equivalence…prerequisite) wrong in this case?

Going by the video explanation, if we are to focus on ‘exchanged benefits’ and that both are equally benefited, doesn’t ‘equivalence’ convey that? Furthermore, doesn’t ‘prerequisite’ fit better than ‘conducive’, given that half of the sentence is about the ‘maintenance of a community’ – effectively, given the sentence already includes ‘maintenance’ doesn’t ‘prerequisite’ sound more logically additive compared to ‘conducive’, which sounds repetitive?

2

We can grudgingly accept “prerequisite” as a possible answer for b2, however, “equivalence” definitely doesn’t fit “exchange” that is “giving” and “receiving” of benefits.

To put “equivalence” would imply “equivalence” between rulers and citizens, which is not what the sentence is saying.