The Sponge,a Colonial Protist,digests Its Food Using ______________________

The sponge,a colonial protist,digests its food using ______________________.  

A) a saclike gastrovascular cavity
B) phagocytic collar cells and amoeboid cells
C) a single opening through which food enters and wastes leave
D) enzymes secreted by cells lining the gastrovascular cavity
E) a muscular digestive organ that chemically and mechanically breaks down food