Final answer:
The thoracic cavity contains the heart, along with the lungs, and is enclosed by the rib cage. The thoracic cavity contains the heart, which is located in the mediastinum. The stomach is not located in the thoracic cavity, but in the abdominal cavity. The brain is located in the cranial cavity, which is part of the posterior (dorsal) cavity.
Step-by-step explanation:
The thoracic cavity contains several vital anatomical structures within the ventral cavity of the human body. Specifically, it houses the heart and the lungs, enclosed by the rib cage. The thoracic cavity is separated from the abdominopelvic cavity by the diaphragm. Therefore, the correct answer to the question is c) Heart.