There’s no context but I think B) the sonnet
I believe the correct answer is B) Sam and Hally enjoy the intellectual exchange.
I came to this conclusion because Fugard uses this to show how inconsiderate Hally is of Sam's perspective, and despite seeing himself as politically progressive, he still harbors obvious racists views.
C or D. C because varying delivery isn't something that alot of people worry about, or D, because some times you don't need to use key words. I wouldn't trust myself with this answer, so be careful.
Whenever you're examining supporting details and combining them with your own knowledge to create meaning, you are simply: Identifying the main idea. Hope that helps.