Please choose the correct ending to complete the given sentence: BMX: A person is seen sitting on a bike before a track looking down. the man

Ending1: then jumps on the bike and begins riding down the track. Ending2: then begins riding down the track with several others riding in front. Ending3: stands up and starts running down the track. Ending4: then mows down the field while walking.

Answer format: ending1/ending2/ending3/ending4