Which bones are part of the arm?

The selection of clavicle, humerus, ulna, and radius identifies the primary bones associated with the arm. The clavicle, commonly known as the collarbone, connects the arm to the body; it plays a crucial role in shoulder movement and stability. The humerus is the long bone in the upper arm, extending from the shoulder to the elbow, facilitating movement and support for the upper limb. The ulna and radius are the two bones in the forearm. The ulna is on the inner side of the forearm, while the radius is on the outer side, allowing for the rotation of the wrist and hand.

In contrast, the other options include bones that are not part of the arm. The second choice presents bones of the lower leg, the third option lists bones pertaining to the shoulder girdle and spine, and the fourth option consists of pelvic and wrist bones. Each of these selections fails to encompass the specific anatomy relevant to the arm, making the first choice the only accurate representation of arm bones.