Final answer:
The upper arm bone is known as the Humerus. It is the only bone in the arm and connects with the forearm's ulna and radius at the elbow.
Step-by-step explanation:
The name of the upper arm bone is D) Humerus. The humerus is the largest and longest bone in the upper limb and is the single bone in the upper arm. It forms an articulation with the scapula, or shoulder blade, at the shoulder, and with the radius and ulna at the elbow to make up the arm's structure.
The forearm is comprised of the ulna and radius, where the ulna is found medially (towards the pinky-finger side) and the radius is situated laterally (towards the thumb side). These two bones of the forearm articulate with each other and with the carpal bones of the wrist, contributing to the limb's range of motion.