Explanation
Correct answer: A.
Choice A is the best answer. The author of Text 2 argues that Morrison's use of the sermon is not only influenced by Ellison, but also by a "community-wide strategy of resistance" to literary conventions practiced by Black American authors. Ellison, Text 2 alleges, is only one of many influences on Morrison.
Why the other choices are wrong
Choice B
Choice B is incorrect. Neither text specifically mentions sermons in works by authors other than Morrison or Ellison, only a tendency towards eroding "the division between oral and written forms" among Black American writers.
Choice C
Choice C is incorrect. Both texts describe similarities between the works of Ellison and Morrison, and neither points out instances of divergence. Text 2 simply suggests that Morrison was influenced by more than just Ellison.
Choice D
Choice D is incorrect. While Text 2 does discuss Morrison's resistance to certain literary conventions, it's unclear what it would mean for the underlined claim to be "indebted" to that tradition. This choice recycles language from the text, but not in a way that makes any coherent point.