Which of the following is an important rule regarding colon usage? A. The words coming before the colon must form a complete sentence. B. A colon can't be used in a question. C. A colon only introduces a list.
I'd say the correct answer is C) a colon only introduces a list, merely because the other options aren't correct - colon doesn't have to be followed by a sentence, and it can be used in a question.
