Please choose the correct ending to complete the given sentence: River tubing: We see rafts and people in a building. People board a bus and exit at a water park. people

Ending1: grab rafts, and people on rafts fill a river. Ending2: go kayaking in the river. Ending3: ride a train in a subway station. Ending4: meet on a path and do stunts while riding on rafts.

Answer format: ending1/ending2/ending3/ending4