Nudibranchs, a type of predatory sea slug, can have various protuberances (that is, extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plumules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. The claws on the foremost trunk segment of centipedes have a function most similar to that of .
A) rhinophores
B) dorsal plumules
C) cerata
D) chemoreceptors

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      

age range would be the answer