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 leaves, a second ball onto carpet, a third ball onto brick, and a fourth ball onto grass.<sep>group: bouncing
question: Which ball bounces the highest?<sep>A: leaves<sep>B: carpet<sep>C: brick<sep>D: grass