Final answer:
The pun in the joke requires imagining the man with 'bare' human feet (option b) as a play on words, not literal bear paws.
Step-by-step explanation:
The joke, 'That man on the beach was so hairy! Did you see his bare feet?' relies on a play on words, specifically a pun based on the homophonic resemblance between 'bare' meaning uncovered, and 'bear,' the animal. Given the context of the joke, one should imagine a man with human feet that are 'bare' or uncovered, rather than 'bear paws' which would imply the man has the feet of a bear which is not logical in the given scenario.
The joke aims to highlight the man's hairy nature by comparing the hairiness of his feet to that of a bear, hence playing with the dual meaning of the word 'bare.'