Please choose the correct ending to complete the given sentence: BMX: These people are all shown participating in a bicycle race. they

Ending1: are all represented in a big black box. Ending2: are crossing the finish line with only one wheel. Ending3: synchronize and then go in the opposite direction, all in shifts. Ending4: ride over huge bumps and straight smooth paths, and everyone is wearing different colored suits and helmets.

Answer format: ending1/ending2/ending3/ending4