Please choose the correct ending to complete the given sentence: River tubing: There are some people water tubing down a river. one of the tubers

Ending1: makes it up onto the higher rocks where he joins another tuber on the lower rocks. Ending2: comes on a blue tube wearing a yellow helmet and blue vest is followed by several tubers also on blue tubes. Ending3: falls off of one of his boards. Ending4: almost goes over a high bar while going down.

Answer format: ending1/ending2/ending3/ending4