Question

Why does Darry punch Steve when he calls Darry all brawn and no brain?   A. Darry is sensitive about being dumb.   B. Darry doesn't like Steve.   C. Darry is smart but needs to work for his brothers.   D. Darry punches those who insult him.

Answer 1

The answer is C. Darry is smart, but he had to work for his brothers. (If this is about the book The Outsiders). In that section of the book it even said he graduated high school and won a scholarship to college, he was taking care of "six greasers", two of which were his brothers, not because he had to but because he wanted to. 

Answer 2

A. He is sensitive because steve is saying "you are all muscle and no smarts"