Adifference between coelomates and pseudocoelomates is that
a. one has bilateral symmetry and one does not.
b. pseudocoelomates have a true coelom.
c. the gut of a pseudocoelomate is surrounded by the body cavity, and the gut of a coelomate is surrounded by the mesoderm.
d. the gut of a pseudocoelomate is surrounded by the endoderm, and the gut of a coelomate is surrounded by the ectoderm.
i have no

"Pseudo" means false. Therefore, we can eliminate B from the choices since pseudocoelomates have a "false body cavity". Pseudocoelomates have a body cavity but it is not lined with mesodermal cells while coelomates have a body cavity lined with mesodermal cells. Therefore, the best answer is option C. the gut of a pseudocoelomate is surrounded by the body cavity, and the gut of a coelomate is surrounded by the mesoderm.