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.
Q: context: A person is trying to bounce a rubber ball. They drop a first ball onto leaves, a second ball onto snow, a third ball onto concrete, and a fourth ball onto carpet.<sep>group: bouncing
A:
user
which material does the person need to bounce the rubber ball?
a. leaves
b. snow
c. concrete
d. carpet
assistant
Which material does the person need to bounce the rubber ball?
A. Leaves
B. Snow
C. Concrete
D. Carpet
assistant