The correct option is C Sipunculus
Peanut worms (Sipuncula) are pink smooth fat worms which are sometimes seen on the shores. They are more commonly encountered in mangroves and on soft ground. Sipunculus is an unsegmented marine worm, probably diverged from primitive annelid stock. Most peanut worms eat detritus, most of them mopping it up from the surface. Hence, option B is the correct answer.