Amoebocytes in a Sea Star Immune Function as Plasmatocytes in a Fruit

Amoebocytes in a sea star immune function as plasmatocytes in a fruit fly.What function do these cell types have?

A) They are both innate physical barriers.
B) They are both mucous membranes.
C) They are both phagocytic cells.
D) They both are enzymes that inhibit bacterial growth.
E) There are no common characteristics between these.