Given the task definition, example input & output, solve the new input case.
You are given a sentence, a question and two answer options. Your task is to write down the index ('A' or 'B') of the **incorrect** option for the given question.
Example: Sentence: Jacob and Benny are squatting at the gym. Jacob has thin frail legs and Benny has big strong legs. Question: Who squats less weight? (A) Jacob (B) Benny
Output: B
Typically, people with thin frail legs squat less weight than people with big strong legs, so the incorrect answer is Benny.

New input case for you: Sentence: Astronauts exploring the galaxy first land on a red planet and later land on a green planet. The red planet is larger in mass than the green planet. Question: On which of these planets will the astronauts feel a lower gravitational force? (A) the red planet (B) the green planet
Output:
A