When swift the narrator suggests that his proposal is modest what rhetorical technique is he using? a)hyperbole b)idiom c)understatement d)sarcasm

When swift the narrator suggests that his proposal is modest, the rhetorical technique he was using is understatement. So the correct answer is 
C)Understatement . The other choices are incorrect because it does not show any understatement in its excerpt.

C is correct for apex

Carbon dating is one

Iwant five points, so sorry to ruin your time.