Explanation
Correct answer: C.
Choice C is the best answer because it best describes the main purpose of the text, which is to explain why a certain rap album is particularly innovative. The text mentions rap artist and professor A.D. Carson, who published "the first peer-reviewed rap album." The text also describes the unusual process of having the work evaluated by both scholars and rap artists before its release, and details how the album combines elements of a mixtape album with elements of scholarly essays. All of these characteristics of the album and the way in which it was developed help to demonstrate the album’s novelty.
Why the other choices are wrong
Choice A
Choice A is incorrect because though the text mentions an album that combines elements of scholarly essays and mixtapes, it does not compare the relative public impact of scholarly articles and albums.
Choice B
Choice B is incorrect because the text does not present the opinion of a scholar regarding the rap album.
Choice D
Choice D is incorrect because though the text mentions that the album was peer reviewed, it does not detail the steps of the review.