This excerpt form Faulkner's Nobel Prize speech contributes to the overall purpose of the speech by describing the key ingredient in the writing of truly great fiction (C).
Faulkner notes that today's writers are unsuccessful because they forgot about the problems of the human heart. Rather than congratulating them for their writing, he encourages them to think about the human heart in conflict. He states that it is the only thing that will make their writing worth it. Therefore, by including the human heart in their writing they will write great stories.