Please choose the correct ending to complete the given sentence: BMX: A line of bikers prepare for a dirt bike race. they

Ending1: ride on and on, quickly adjusting their mounts. Ending2: take off, racing over hills and around sharp corners, some falling off their bikes and kicking it angrily. Ending3: take off in bicycles straight across the dirt race track. Ending4: race each other until one starts off with a straight stroke.

Answer format: ending1/ending2/ending3/ending4