Which artery supplies the major blood flow to the leg?

The femoral artery is the primary vessel that supplies blood flow to the leg. Emerging from the external iliac artery, it travels down the thigh and branches into the popliteal artery at the back of the knee. This artery is crucial because it provides oxygenated blood to the muscles and tissues of the thigh, as well as to the lower leg and foot through its branching arteries.

The other options pertain to different anatomical regions or functions. The popliteal artery is a continuation of the femoral artery and supplies blood to the knee and lower leg, but it does not supply the major blood flow to the leg as a whole. The brachial artery is responsible for blood flow to the arm, and the aorta is the main artery of the body supplying blood to the systemic circulation, but it is not specific to the leg. Thus, the femoral artery's role as the main supply line to the leg makes it the correct choice in this context.