The radius articulates with which of the following structures?

The radius is one of the two long bones in the forearm, and it primarily articulates with the carpal bones at the wrist. This articulation allows for the complex movement and function of the wrist joint. The distal end of the radius features a structure known as the styloid process, which helps form a joint surface with the carpal bones, facilitating movement and stability in the wrist.

Additionally, while the radius does articulate with the ulna and the humerus at different points, the question specifically pertains to the radius's relationship with carpal bones, which is a direct and functional articulation at the wrist. The radius does not interact with the phalanges; instead, it connects to structures that work in tandem to allow for a range of motions in the hand and wrist. This is why the correct answer highlights the radius's articulation with the carpal bones.