Final answer:
The liver is found in the abdominal cavity.
Step-by-step explanation:
The liver is found in the abdominal cavity.
The abdominopelvic cavity is the largest cavity in the body, and it houses the digestive organs. The liver is located in the upper right part of the abdomen, just below the diaphragm and to the right of the stomach.
The liver plays an important role in digestion by secreting bile. The thoracic cavity contains the lungs and heart and is separated from the abdominopelvic cavity by the diaphragm. Within the abdominopelvic cavity, there is a distinction made between the abdominal cavity, housing digestive organs, and the pelvic cavity, housing reproductive organs.
Given these distinctions, the liver is found within the abdominal cavity. Thus, among the options provided, the correct answer is that the liver is found in the abdominal cavity (3). It is not located in the cranial cavity, thoracic cavity, or pelvic cavity.