Premise: "Body surfing at the concert."\nBased on this premise, can we conclude that the hypothesis "A concert performer body surfing in a crowd of fans." is true?\nOptions:\n- yes\n- it is not possible to tell\n- no
Think hard. Detailed solution:
it is not possible to tell
Not all body surfers are concert performers.

Not all body surfing happens in a crowd of fans.

.

Therefore, the answer is it is not possible to tell