You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct answer (return the string of the correct option, not 'A' or 'B') for the given question.

Sentence: Barry was driving his new car. As he drove on the new road, there were no problems, but it was a rough drive on the gravel side road. Question: Which road way would have generated more heat as Barry drove? (A) new roadway (B) gravel.
gravel