The outer thin,flat,epithelial-like cells that cover the outside and some inside surfaces of sponges,are

A)amoebocytes.
B)pinacocytes.
C)choanocytes.
D)spicules.
E)spongin.Pinacocytes line the outer surface of the body wall of sponges.They may ingest food by phagocytosis and many are contractile to help regulate water flow.