instruction:
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.
question:
Sentence: A speed boat and a row boat take off from a dock. The row boat is barely moving, while the speed boat zooms off at a quick pace. Each boat stops at the same time. Question: Which boat is closer to the dock it left from? (A) row boat (B) speed boat
answer:
row boat

question:
Sentence: The ranger and the rustler both were riding horses that galloped at the same speed. The rustler left an hour before the ranger. Question: Who has traveled further? (A) the ranger (B) the rustler
answer:
the rustler

question:
Sentence: Mike was comparing the mass of a boulder and a pebble. He found that the mass of the boulder was much greater then the mass of the pebble. Question: Which item emits weaker gravity? (A) boulder (B) pebble
answer:
pebble