Task: Text Completion
Input (English): Several people carry intertubes into the river, climbing on them. They ride the intertubes down the waves of the river and over small waterfalls. they <sep> (A) ride under a bridge, then float in the water. (B) ride for several more days through rocky terrain and small waterfalls and views of the water. (C) use the intertubes as anchors as they ride to the bottom, and continue their lives. (D) continue riding around the river together.
Output (English): A