Which excerpt tells the reader that the sniper's experience has made him older than his years? a. "his face was the face of a student, thin and ascetic, but his eyes had the cold gleam of the fanatic. they were deep and thoughtful, the eyes of a man who is used to looking at death." b. "he wanted to fire, but he knew it was useless. his bullets would never pierce the steel that covered the gray monster." c. "he must kill the enemy and he could not use his rifle. he had only a revolver to do it. then he thought of a plan." d. "the sniper looked at his enemy falling and he shuddered. the lust of battle died in him."