Answer:
B he feels obligated and doesn't want to let him down
Step-by-step explanation:
A Separate Peace is a novel by John Knowles about two best friends: Gene and Phineas (popularly called Finny) and their one sided rivalry- with Gene competing with Finny academically because he believes Finny is much better at athletics.
The rivalry and jealousy by Gene reaches a climax when he impulsively shakes the tree Finny was about to jump from, causing him to be permanently crippled.
Gene feels obligated to Finny and follows whatever he says because he loves and adores his friend.