As Oceans Become More Acidic, the Shells of Tiny Sea

As oceans become more acidic, the shells of tiny sea snails tend to dissolve. a.This is a concern because:

A) The snail shells provide material for jewelry making on south sea islands.
B) The shells are ground up and used for fertilizer for agricultural crops.
C) The snails are the base of a food web that supports entire polar ecosystems.
D) More than one of these are correct.
E) None of these answers.