Final answer:
The forearm consists of the radius and ulna, which are the two bones that extend from the elbow to the wrist in the human body. The answer is option b.
Step-by-step explanation:
The forearm consists of two bones: the radius and ulna. To be specific, the radius is located on the lateral side of the forearm, which corresponds to the thumb side, and it articulates with the humerus at the elbow. The ulna is on the medial side, which corresponds to the pinky-finger side. It is longer than the radius and also articulates with the humerus at the elbow. In total, each upper limb contains 30 bones, but specifically, the forearm is made up of just the radius and ulna.
Hence, the answer is option b.