Mollusks have a complete function coelom

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Mollusks have a complete function coelom

Why don’t mollusks have a complete function coelom?

A. The coelom is reduced because other aspects of the mollusk body plan fulfill its functions.

B. Because they evolved from an ancestor that lacked a coelom. 

C. They have a functional pseudocoelom. 

D. The coelom evolved independently in molluscs.

Please provide an explanation!

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