has the largest diameter of any vessel in the body. А.
Aorta
B. Superior vena cava
C.
Inferior vena cava
D. Abdominal aorta

D. Abdominal aorta

Explanation:

An enlargement of the aorta, the main blood vessel that delivers blood to the body, at the level of the abdomen.

An abdominal aortic aneurysm (AAA) can be life-threatening if it bursts. Abdominal aortic aneurysms are most common in older men and smokers.

An abdominal aortic aneurysm often grows slowly, without symptoms. As it grows, some people may notice a pulsating feeling near the navel. Pain in the back, belly, or side may be signs of impending rupture.

Stopping smoking may slow their growth. Small ones may only need monitoring. Aneurysms that are too large or growing too quickly should be repaired with surgery.