They disagree about how mama use the insurance money she is about to receive. Beneatha tells Walter, “that money belongs to mama, walter, and it’s for her to decide how she wants to use it”. Walter believes Beneatha covets mama’s money for medical school, while Walter wants to buy a liquor store with the money. It’s also clear that Walter resents Beneatha.
When he says "My will to her consent is but a part; An she agree, within her scope of choice Lies my consent and fair according voice." He is saying here that his consent to Juliet and Paris' marriage is "but a part" of the decision, so he believes that her choice is also needed. He says that, while his "consent and fair according voice" may play a part in her choice, she still has a choice, free will.
Irony is a figure of speech in which words convey the opposite of their literal meaning or a situation is contradictory to what one would expect. So the answer would be C.
because it taught and showed him what to keep in mind
