Which artery mainly supplies blood to the leg?

The femoral artery primarily supplies blood to the leg, making it the correct choice. This artery is a continuation of the external iliac artery and is responsible for delivering oxygenated blood to the thigh and further branches off to supply the lower leg. Its position in the anatomical structure of the body is key—after passing through the groin area, it becomes the primary source of blood flow for the leg's muscles and tissues.

In contrast, the subclavian artery primarily supplies blood to the upper limbs and parts of the upper torso. The radial artery, while important for the forearm and hand, does not supply the leg at all. The carotid artery is crucial for supplying blood to the brain, neck, and face, but it is not involved with the leg's blood supply. Understanding the distribution of blood flow through these arteries is essential for recognizing how the body's vascular system meets the demands of various regions, especially in emergency situations.