Answer: 4.the second clause contains a quotation.
Explanation:
Colons (:) are used in sentences to show that something is following, like a quotation, example, or list. A colon can be used to separate two independent clauses when a) the second clause is directly related to the first clause (not just vaguely related) and b) when the emphasis is on the second clause.
D. would make the most sense because you can't start a sentence with both for letter B. Hailey and me for letter C would not make any sense either, the correct response here would be Hailey and I. For Letter A, never start with a transition word unless it starts with, Then,.....
The correct answer is D