Can somebody explain why the answer is B? An elementary school science teacher d

Question

Can somebody explain why the answer is B?

An elementary school science teacher decided to liven up the classroom with a saltwater aquarium. Knowing that saltwater 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 herbivorous gastropod varieties. Lastly, she added some vertebrates-a parrotfish and a clownfish. She arranged for daily feedings of copepods and feeder fish The bivalves started to die one by one; only the undamaged shells remained. To keep the remaining bivalves alive, the teacher would have to remove the

Explanation / Answer

The teacher must have to remove the sea star from the aquarium in order to protect remaining bivalves from getting killed by sea star because sea star is the onlyone in the aquarium which feeds on bivalves.

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