Please choose the correct ending to complete the given sentence: Snow tubing: There are people at the top of a snowy hill on tube rings. suddenly the people

Ending1: grabbing snow mobiles get stuck on rails on the sides of the tubes. Ending2: lift up their backpacks and go down the slope. Ending3: stand still, then start rolling down the slope on their tube. Ending4: start riding down the hill.

Answer format: ending1/ending2/ending3/ending4