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Which of the following sentences is punctuated correctly?
a. She was late, because her alarm clock was broken.
b. In the midst of the long dull movie I decided to get some popcorn.
c. The Chinese are trained to write with their right hands, for it is difficult to do Chinese Calligraphy with the left hand.
d. He sat down at his desk this morning, and made a preliminary draft of his speech.