The best answer would be D. They bought two large bags of popcorn. this would be the best answer because the verb (brought) connects a subject (bags/popcorn) with the noun (large) that describes the subject (bags/popcorn).
Not A, Not B, Not C, so the answer is D because the second statement is giving evidence not explaining the evidence
That sounds like Alice in Wonderland I don't think it's a story, just made up for a textbook, but the answer is A.
