Please choose the correct ending to complete the given sentence: BMX: The video is about bristol bmx club holding a biking event. There's a man drawing a white starting line on the ground for the race. the bikers

Ending1: start racing over white road. Ending2: are riding dirt bikes. Ending3: get ready to begin their race. Ending4: go over the long track and start jumping on track boards together.

Answer format: ending1/ending2/ending3/ending4