The correct option is C Bombyx, Pleurobrachia, Culex, Locusta
The image shown represents a coelomate organism. The body cavity, which is completely lined by mesoderm, is called true coelom. Animals possessing true coelom are called coelomates or eucoelomates.
Arthropods are coelomates. For example: Bombyx, Culex and Locusta. Pleurobrachia is a member of the phylum ctenophora and it is an acoelomate animal. Hence, option c is the appropriate one.
All others options include animals such that more than one of them are exceptions.