Question

“does pointillism use dots—or was it lines?” the weary art student wondered aloud, before falling asleep?
no change
asleep.
asleep;
asleep—

Explanation:

The original sentence ends a declarative statement (the student's action of falling asleep after wondering) with a question mark, which is incorrect. The phrase "falling asleep" is part of a declarative clause here, so it should end with a period. The word "asleep" is correctly lowercase (since it's not a proper noun or start of a new sentence here), and there's no need for a semicolon or dash. So the correct option is the one with "asleep." followed by a period.

Answer:

B. asleep.