Identify the bones listed in the problem: Fibula, Humerus, Femur, and Tibia.
Understand the location and function of each bone: The Fibula is located in the lower leg, the Humerus in the upper arm, the Femur in the thigh, and the Tibia in the lower leg.
Recall that the Femur is the bone in the thigh and is known for being the longest bone in the human body.
Consider the anatomical significance of the Femur: It supports the weight of the body and allows for a range of movements at the hip and knee joints.
Conclude that among the options provided, the Femur is the longest bone in the human body.