Which cavity includes the urinary bladder and reproductive organs?

The pelvic cavity is the correct answer because it encompasses the area that houses the urinary bladder, the reproductive organs, and other structures such as parts of the intestines. This cavity is located below the abdominal cavity and is bordered by the pelvic bone.

In contrast, the thoracic cavity is located in the upper body and contains vital organs such as the heart and lungs, but does not include the urinary bladder or reproductive organs. The spinal cavity, also known as the vertebral cavity, surrounds the spinal cord and does not contain any of the organs related to the urinary or reproductive systems. The cranial cavity, on the other hand, encases the brain and is not related to the organs mentioned in the question.

Thus, the pelvic cavity is specifically designated for the organs mentioned and plays a crucial role in functions related to both the urinary and reproductive systems.