Question

the head of the radius articulates with the
capitulum.
carpals.
styloid process.
trochlea.
olecranon process.

Explanation:

The head of the radius articulates with the capitulum of the humerus at the elbow - joint. The carpals are in the wrist, the styloid process is a projection on the radius and ulna, the trochlea articulates with the ulna, and the olecranon process is part of the ulna that forms the point of the elbow.

Answer:

capitulum.