What was the question for this implicit rationale, and corresponding answer?
They must be on a boat in order to guide them down the river.
 The answer: yes
The question: Premise: "A man is playing the piano and a woman in white is singing while a third man guides them down the river."
Hypothesis: "The people are on a boat."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no