**Core Concept**
The great saphenous vein is a superficial vein of the lower limb, playing a crucial role in venous drainage. Its anatomy is significant in both clinical practice and surgical procedures.

**Why the Correct Answer is Right**
The great saphenous vein originates from the medial marginal vein of the foot and ascends along the medial aspect of the leg, passing anterior to the medial malleolus and the tendo Achilles. It then continues upwards, piercing the fascia of the leg and entering the femoral sheath, where it becomes the femoral vein. This anatomical pathway is essential for understanding various vascular procedures, including vein harvesting for coronary artery bypass grafting.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the great saphenous vein does not originate from the dorsal venous arch of the foot.
**Option B:** This option is incorrect because the great saphenous vein does not pierce the fascia of the leg until it reaches the femoral sheath.
**Option C:** This option is incorrect because the small saphenous vein, not the great saphenous vein, ascends along the posterior aspect of the leg.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that the great saphenous vein is a common site for varicose vein surgery due to its superficial location and accessibility.

**Correct Answer:** A.