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.

Let me give you an 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
The answer to this example can be: B
Here is why: Typically, people with thin frail legs squat less weight than people with big strong legs, so the incorrect answer is Benny.

OK. solve this:
Sentence: Mitch is rolling wagons down a hill at the same time. The red wagon goes to the bottom of the hill, but the black wagon stops halfway down the hill. Question: Which wagon was slower? (A) red wagon (B) black wagon
Answer:
A