Please choose the correct ending to complete the given sentence: BMX: We see a blue intro screen. We see kids riding dirt bikes. we

Ending1: see a person on a bike in a parking lot and a kid pulls a cord. Ending2: see another title screen and the intermediate riders are seen. Ending3: see a man cutting a boy's hair. Ending4: see a shot of a sky.

Answer format: ending1/ending2/ending3/ending4