You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Q: Sentence: A billiard ball has a greater mass then a basketball. Question: Which ball has a stronger field of gravity?

A: billiard ball
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Q: Sentence: A crab can scurry a greater distance over a beach then over an ocean floor. Question: Which surface gives the crab more resistance?

A: ocean floor
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Q: Sentence: A new planet has been discovered with two moons circling it. One is reddish and the other is black and gold. Scientists saw that asteroids were more attracted to the black and gold moon. Question: Which of the moons has weaker gravity?

A:
the reddish moon
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