Detailed Instructions: Creating a multiple-choice question from the given context and a 'group' which indicate the focus of the question. The question must come first, separated by <sep> from the candidate answers. The answer to the question does not have to exist in the context.
Problem:context: A person is trying to bounce a rubber ball. They drop a first ball onto grass, a second ball onto concrete, a third ball onto rubber, and a fourth ball onto brick.<sep>group: bouncing
Solution:
question: Which ball bounces the least?<sep>A: grass<sep>B: concrete<sep>C: rubber<sep>D: brick