The Following Questions Refer to the Paragraph Below

The following questions refer to the paragraph below.
An elementary school science teacher decided to liven up the classroom with a salt-water aquarium. Knowing that salt-water aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank with various marine invertebrates, including a polychaete, a siliceous sponge, several bivalves, a shrimp, several sea anemones of different types, a colonial hydra, a few coral species, an ectoproct, a sea star, and several gastropod varieties. Lastly, some vertebrates-a parrotfish and a clownfish-were added. She arranged for daily feedings of copepods and feeder fish.
-Had the teacher wanted to point out organisms that belong to the most successful animal phylum, the teacher should have chosen the 1. bivalves.
2) sea anemones.
3) shrimp.
4) polychaete.
5) copepods.

A) 1 only
B) 4 only
C) 3 and 5
D) 4 and 5
E) 1, 2, and 3