Please choose the correct ending to complete the given sentence: Doing motocross: A person stands, shakes their head and leaves on a dirt bike. Two guys sit on their dirt bike and discuss. one guy

Ending1: makes a circle with a chain into the dirt bike. Ending2: uses his rear tire to cause dirt to spray. Ending3: pushes the other guy holding up rocks. Ending4: mounts the dirt bike and starts working out.

Answer format: ending1/ending2/ending3/ending4