Please choose the correct ending to complete the given sentence: Doing motocross: There's a dirt biking event going on which is sponsored by monster energy drink. there

Ending1: are a lot of participants trying to push themselves forward in order to take off the falling dirt. Ending2: is 2 people on biking bikes and they have fur on their legs. Ending3: are several contestants participating in the event. Ending4: 's a gate open and people are riding bikes and playing sports on the track.

Answer format: ending1/ending2/ending3/ending4