TASK DEFINITION: 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.
PROBLEM: Sentence: Bob likes to skip rocks across the lake. He skipped rocks on a calm day when the lake was smooth and on a windy day when the lake was choppy. He noticed that the rock encountered less friction on the smooth lake than the choppy lake. Question: Which lake would the rock skip farther on? (A) The smooth lake (B) The choppy lake

SOLUTION: The smooth lake

PROBLEM: Sentence: A steel ball has a greater mass then a pebble. Question: Which object has a stronger gravitational field? (A) steel ball (B) pebble

SOLUTION: steel ball

PROBLEM: Sentence: Mary was practicing karate by trying to break objects. She broke the plywood easily with her hand, but couldn't break the wooden stud no matter how hard she hit it. Question: Which object is the thicker one? (A) plywood (B) wooden stud

SOLUTION:
wooden stud