good explanation needed! im confused

Question

 Gummy Worms are a synthetic material, made when two chemicals, sodium alginate and calcium chloride, are mixed and allowed to react. Sodium alginate is isolated from seaweed. The other ingredient, Calcium chloride, is obtained from limestone. Which of the following is a negative environmental impact from producing Gummy Worms? 

(my choice is B but i am not sure)

The underwater ecosystem is negatively affected because the seaweed provides food and shelter for small aquatic organisms.

Consumers of Gummy Worms can develop digestive issues.

It is sometimes necessary to harvest resources from the water or land.

Seaweed and limestone are so plentiful in our world that obtaining them has no effect on the environment.

Answer 1

The underwater ecosystem is negatively affected because the seaweed provides food and shelter for small aquatic organisms.