Please choose the correct ending to complete the given sentence: BMX: People bike on a bumpy track where a crowd gather to watch the bike cross competition. A biker falls on the ground. the bikers

Ending1: start a competition and fight. Ending2: arrive to the finish line. Ending3: do 10 km in heavy traffic, in the bleachers, and then on the track where a competitor passes his head on a plate. Ending4: race each other back and forth, then finally stop.

Answer format: ending1/ending2/ending3/ending4