The correct answer is D. Femur.
The femur is the longest bone in the human body. It is also the strongest bone in the body. The femur is located in the upper leg and connects the hip to the knee. It is a long, slender bone that is curved slightly to allow for movement. The femur is made up of two main parts: the shaft and the head. The shaft is the long, cylindrical part of the bone. The head is the rounded part of the bone that fits into the hip socket.
The femur is a very important bone. It supports the weight of the body and allows for movement of the leg. The femur is also involved in many activities, such as walking, running, and jumping.
The other options are incorrect because they are not the longest bones in the human body.
- The stapes is the smallest bone in the human body. It is located in the middle ear and helps to transmit sound waves from the eardrum to the inner ear.
- The fibula is the smaller of the two bones in the lower leg. It is located on the outside of the leg and helps to support the weight of the body.
- The tibia is the larger of the two bones in the lower leg. It is located on the inside of the leg and helps to support the weight of the body.