What impact does the visit to Leper have on Gene?

A.
It makes Gene hate the war for what it's done to Leper.

B.
It reassures Gene that he will be able to deal with the war without any problems.

C.
It terrifies Gene and makes him want to return to Finny, who insists that the war is not real.

D.
It makes Gene realize that what he's done to Finny is not that bad.