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Which sentence from the story BEST indicates the climax?

A. For a long time he lay awake thinking these things, and once he sat up in bed and said aloud, "I will prove that I am not crazy."

B. "Then he pushed the bedclothes aside and put his left leg on the floor."

C. "Slowly he began to realize the full meaning of the thing."

D. "I believe there's someone coming down to see you from the Air Ministry after breakfast," she went on.