Preferred access point for a superficial venous blood draw is the right subclavian vein external jugular vein median cubital vein axillary vein brachiocephalic vein

         The correct option is MEDIAN CUBITAL VEIN.

Reason:

Right sub clavian vein:

                   It receives blood from right lymphatic duct and also empties its lymph from the body inside it.  

External jugular vein:

                   It drains blood from the head, brain, face and neck.

Median cubital vein:

                   It is superficial vein of upper limbs.  It receives blood from basilic and cephalic vein  

Axillary vein:

                   It carry deoxygenated blood from thorax, armpits, and upper limbs toward the heart.

Brachiocephalic vein:

It carries deoxygenated blood from the rib cage to superior vena cava of heart.