This is a test of commonsense with single/multi-choices. Complete the next sentence:

A large group of people are seen sitting in the water looking around. another group

Available choices: (A). begins riding in on a raft riding in on their side behind others.. (B). is down the pool doing laps around one another.. (C). are seen kite surfing along the water.. (D). practices rock climbing and is shown riding around on surfboards..
The answer is:
(C).