Final answer:
The ulna is the medial bone of the forearm and has several prominent features, but the D) radial tuberosity is not found in the ulna.
Step-by-step explanation:
The ulna is one of the two bones in the forearm, along with the radius. It is the medial bone of the forearm and runs parallel to the radius.
The ulna has several prominent features, including the olecranon process, which forms the bony tip of the elbow; the trochlear notch, which articulates with the trochlea of the humerus as part of the elbow joint; and the radial tuberosity, which is a roughened area on the anterior ulna.
Therefore, the correct answer to the question is D) Radial tuberosity because it is not found in the ulna.