Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: If the horse is tied to the boat then the mother and her two sons are not taking their boat for a ride on the lake.
 The question and answer:
Premise: "A mother and her two sons walk behind a horse tied to a boat."
Hypothesis: "A mother and her two sons are taking their boat for a ride on the lake."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
The answer is it is not possible to tell