Which bone is located distal to the elbow in the forelimb?

The radius is the correct answer because it is one of the two primary bones of the forelimb, specifically located in the antebrachium (the area of the forelimb between the elbow and the wrist). The radius runs parallel to the ulna and extends distally from the elbow joint to the wrist. This positioning makes it anatomically the most distal bone in the forelimb when compared to the others listed.

In contrast, the humerus is the bone that makes up the upper part of the forelimb and connects at the elbow joint, thereby being proximal to the radius. The femur is located in the hind limb, serving as the thigh bone, while the clavicle is a bone that connects the arm to the body but does not specifically relate to the forelimb bones positioned between the elbow and the wrist. Thus, the radius is distinctly positioned distal to the elbow joint in the context of the forelimb anatomy.