A bodily cavity known as a pseudocoelom is situated among mesodermal and endodermal tissue.

The above-given statement is correct.

1. A bodily cavity known as a pseudocoelom is one that is partially enclosed by mesodermal tissue and partially by endodermal tissue. 
2. A "real" coelom can be separated into compartments since it is entirely encircled by mesodermal tissue. 
3. The internal organs of the nematode, including the alimentary system and the reproductive system, are bathed in the pseudocoelom, a bodily cavity filled with fluid that is located inside the external body wall of the nematode. 
4. Pseudocoelom is a partially functional fake coelom. Mesoderm tissue lines only a coelom completely. Coeloms developed from pseudocoeloms, which appeared early in the evolution of animals. Mesoderm tissue lines only a coelom completely.

Hence, option A is the correct answer.