Answer: Option B
:
B
Water vascular system, also called ambulacral system is a characteristic feature of Phylum Echinodermata. Itserves for locomotion, respiration and food capture.It basicallyconsists of a system of canals and reservoirs containing a watery fluid, the system consisting of a sieve plate, or madreporite, and a ring vessel, or water-vascular ring, that are connected by a frequently calcified vessel called the stone canal. Five radial water canals extend outward from the ring vessel and give rise to branches that end in the tube feet, which are in contact with the sea. It is specifically the tube feet thatare used to pass food to the oral mouth at the center, and can attach to surfaces.