b. The thoracic cavity is the cavity of the chest.
Explanation:
A body cavity by definition is a space or potential space in the body, which accommodates different organs or structures of the body. The human body has several body cavities below are some examples:
CAVITY SAMPLE ORGAN
Cranial cavity brain
Thoracic cavity (chest cavity) lungs
Abdominal cavity intestines
Pelvic cavity bladder
Ruling out the rest:
What is being described in choice a. is an orifice.
The pleural cavity is also called pleural space. It surrounds the lungs, but the lungs are not found in it.
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