I am not an instructor, but take a look at the lines that discuss "antidomestic novel," lines 45 through 55.
What do the structural indicators "for" and "but" signal?
"For" signals justification, explanation, or evidence supporting what precedes it, in this case "antidomestic novel."
What follows "but" is why the hierarchy does NOT APPLY to the life of a female slave the way it does to a free woman, hence the "LIMITATIONS of the hierarchy" as revealed by Jacobs per the correct answer-choice C.
Also lines 45 through 48 discuss how the perspective of free women is different that that of slave women because slave women are forced to make difficult decisions that free women do not; pertinent to the antidomestic novel discussion the difficult decisions are sacrificing the hierarchical values as embodied in a complete family and a stable home which free women take for granted!
Again, I'm not an instructor, but these were my reasons for choosing C.