The largest artery is:

Concept: The blood vessels in the human are substantial of two types- arteries and veins. Arteries are the blood vessels that carry the oxygenated blood from the heart to all the other parts of the body whereas veins are responsible for carrying the deoxygenated blood from all the body to the heart which further goes into the lungs for filtration. 

The largest blood vessel present in the human body is the Aorta, which is also the largest artery of the body. It carries oxygenated blood from the heart to the working organs of the body.

Hence, the correct answer is option C.