The correct answer is B. Upper arm.
The humerus is the long bone in the upper arm. It extends from the shoulder to the elbow. The humerus is the second longest bone in the body, after the femur. It is a long, slender bone that is curved slightly to allow for movement of the arm. The humerus is made up of two main parts: the shaft and the two ends. The shaft is the long, cylindrical part of the bone. The two ends are the head and the distal end. The head is the rounded part of the bone that articulates with the shoulder socket. The distal end is the knobby part of the bone that articulates with the radius and ulna.
The humerus is a very important bone in the body. It allows for movement of the arm and shoulder. It also protects the nerves and blood vessels that run through the arm.
The other options are incorrect. The thigh is the upper leg. The forearm is the lower arm. The leg is the lower limb.