A) is the correct option
Step-by-step explanation:
The claws present are functionally similar to rhinophores, a pair of rhinophores is present at the front end of Nudibranchs body
Because of their worm-like shape, rhinophores are in constant danger of being nibbled by fish
To protect them from such damage, most are able to withdraw into a pocket beneath the skin
Often there is a raised collar or sheath around each pocket which can be clamped shut when the slug is disturbed
Nudibranchs detect olfactory clues in the water around them just as land-based creatures smell the air or taste potential food, these chemical cues are how they find food and mates