Q: 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.
context: A person is trying to bounce a rubber ball. They drop a first ball onto brick, a second ball onto steel, a third ball onto concrete, and a fourth ball onto foam.<sep>group: bouncing
A:
question: Which ball bounces the least?<sep>A: brick<sep>B: steel<sep>C: concrete<sep>D: foam