Please choose the correct ending to complete the given sentence: Doing motocross: A person is riding a dirt bike over a hill. someone

Ending1: stands up holding a bike and the rider falls over. Ending2: is running through a sand wall. Ending3: stands on top of a dirt hill. Ending4: jumps off the bike and a weight is seen strapped onto the back.

Answer format: ending1/ending2/ending3/ending4