Fact 1: Adult sponges produce eggs and sperm. Fact 2: Sponges are the most primitive multicellular animals. Given the two facts above, the most primitive multi-cellular animals produce what?

OPTIONS:
(A). Electrical energy;
(B). eggs and sperm;
(C). harmful substances;
(D). scarce resources;
(E). Organic compounds;
(F). Chemical energy;
(G). fur and fat;
(H). aerobic capacity;
The answer is:
(B).