Sponge Choanocytes Collect Food Particles,but There Is No Food Distribution

Sponge choanocytes collect food particles,but there is no food distribution system within a sponge; how might surface cells receive nourishment?

A) They do not; surface cells die and are regularly replaced by cell division of nourished choanocytes.
B) Nutrients must diffuse from the choanocytes to surface cells.
C) Amoebocytes transfer food from the choanocytes to the nonfeeding cells.
D) Nutrient-rich choanocytes periodically fuse with nonfeeding cells, transferring nutrients as the cytoplasm mixes.