Please choose the correct ending to complete the given sentence: Playing polo: Several people are riding horses in an outdoor arena. they

Ending1: are involved in a game of polo. Ending2: are tied onto ropes and jumping up and down. Ending3: are lined up in a border drawn. Ending4: come in a large arena and take off through jumps and ropes and into the sand.

Answer format: ending1/ending2/ending3/ending4