Identifying Bones in the Human Arm

Steps:

• Examine the diagram for key arm bones: humerus (upper arm), radius and ulna (forearm).
• Match labels to anatomical positions: humerus connects shoulder to elbow, radius and ulna to wrist.
• Eliminate options mislabeling bones or joints.
• Select the option correctly identifying all structures.

Why D is correct:

• D accurately labels humerus as upper arm bone, radius as lateral forearm bone, and ulna as medial forearm bone, per standard human anatomy definitions.

Why the others are wrong:

• A confuses radius and ulna positions.
• B misidentifies humerus as a forearm bone.
• C incorrectly labels a wrist bone as ulna.

Not enough information on exact diagram details, but based on standard anatomy.

Final answer: D