Instructions: 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.
Input: Sentence: Jane tested a tennis ball on two different surfaces, observing the different results. First, she skidded a tennis ball across a slick hard court, and then across a shaggy grass court. Question: Skidding produces more heat on which surface? (A) hard court (B) grass court
Output:
A