The correct answer is B. Leg.
The tibia is the larger of the two bones in the lower leg. It is located between the knee and the ankle, and it bears the weight of the body when standing or walking. The tibia is connected to the femur (thigh bone) at the knee joint, and it is connected to the fibula (the smaller of the two bones in the lower leg) at the ankle joint.
The tibia is a long, slender bone that is curved slightly from front to back. It has a smooth, round surface on the inside of the leg, and a rough, ridged surface on the outside of the leg. The tibia is made up of two main parts: the shaft and the ends. The shaft is the long, central part of the bone, and the ends are the rounded surfaces at the top and bottom of the bone.
The tibia is a very important bone, and it plays a vital role in walking, running, and jumping. It is also important for maintaining balance and posture.
The other options are incorrect because they do not contain the tibia. The skull is located in the head, the arm is located in the upper body, and the mouth is located in the head.