For this chain-of-thought reasoning and answer, what was the question?
The height of the waves could be other than 20 foot.
 A: it is not possible to tell
Q: Can we conclude from "The man on the board uses the wave to jump high into the air." that "A man on a board uses a 20 foot wave to jump."?
Options:
- yes
- no
- it is not possible to tell