Task: Question Understanding
Input (English): Question: Gordon reads that if an object is closer to the center of a planet, then the force of gravity will be stronger. According to this information, where would the force of gravity be the strongest? (A) in a flying airplane (B) on a tall mountain (C) in a deep valley (D) on an island?
Output (English): object, closer, center, gravity, stronger., force, gravity, strongest?