How will the right answer fit in terms of support and conclusion?

Only the right answer will match the conclusion in the passage.

Highlight the main conclusion in the passage, if there is one:

it has been used to express religious and political messages.

[BACKGROUND] that [CONCLUSION]. After all, [SUPPORT], since [BACKGROUND] as well as [BACKGROUND].

Map the wording of the answers to the wording of the passage:

(A) …accounts for the success of social movements.

The conclusion is only that popular music “has been used”, but it doesn’t say that’s why movements are successful.

(B) …entertainment value has been overemphasized.

This doesn’t map to any statements made in the passage, let alone the conclusion.

(C) Popular music is the most effective way..

The author never says if it’s effective at all, let alone whether it’s the “most effective”.

(D) …has purposes other than entertainment.

That’s a perfect match for “to express religious and political messages”.

(E) …has a profound emotional impact…

There’s nothing in the passage about “emotional impact”.

(D) is the correct answer.