On Sunday we went canoeing and kayaking on the river . We chose to go upstream which was also against the wind . We stopped on an island in the middle of the river and had lunch snacks there .

Question: What must true of how fast the river flowed ?
Answer: The river could not have flowed faster than we could row downstream .The river could have flowed faster than we could row upstream .The river could not have flowed faster than we could row upstream .None of the above choices .