Roundworms are pseudocoelomic. this means that they have a. organs, but no true body cavity. b. a true body cavity, but no organs. c. both organs and a true body cavity. d. neither organs nor a true body cavity.

Option A

Explanation:

All bilateral  organisms have coelomates (cavity). However a Pseudocoelomate organism have a false cavity. By false cavity, we mean that there is a body cavity which is filled with fluid and all internal organs bathe in it including alimentary canal system , reproductive system etc. Unlike a coelom, Pseudocoelomate organism do not have body cavity  completely lined with mesodermal cells.

hence, option A is correct

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