Question

the membrane of the abdominopelvic cavity...
is the peritoneum.
is the paricardium.
is the pleura.
is the pia matter.

Explanation:

The peritoneum is the membrane that lines the abdominopelvic cavity. The paricardium is related to the heart, the pleura to the lungs, and the pia matter is part of the meninges covering the brain and spinal cord.

Answer:

is the peritoneum.