Please choose the correct ending to complete the given sentence: River tubing: There's a large team of participants getting ready to do engage in a water tubing activity. They walk down a hilly terrain to the river. they

Ending1: cross the slow moving waves that roll through from a river. Ending2: get onto their tubes and begin going down the rapids. Ending3: use several different ropes as they hop along the uneven river waters. Ending4: are all doing tubing stunts on the water.

Answer format: ending1/ending2/ending3/ending4