【单选题】He got up, stumbling blind with sleep,.... (Para. 13)
A.
When he got up, he stumbled because he became blind and sleepy.
B.
When he got up, it was still very dark and he was still very sleepy. He could hardly open his eyes and could not see or think clearly, so he walked or moved unsteadily and blindly.
C.
When he got up, he moved unsteadily because he became blind and sleepy.