Please choose the correct ending to complete the given sentence: Snow tubing: A person is tubing down a hill. There is a two little kids in front of them on small tubes. a person in a red jacket

Ending1: is walking on a hill. Ending2: stands at the bottom of the hill. Ending3: is leaning down near the river. Ending4: is riding in the front.

Answer format: ending1/ending2/ending3/ending4