Water vascular system is the characteristic of which group among the following:
(a) Porifera 

(b) Ctenophora 

(c) Echinodermata 

(d) Chordata

Echinoderms have a water-driven tube system that the members of this phylum use for their locomotion. This system is also known as the water vascular system. It also helps in food capturing. So, the correct answer is option C.