Question

what part of this bone articulates with the ulna?
a
b
c
d

Explanation:

The humerus bone articulates with the ulna at its distal - end. In a typical anatomical diagram, the part of the humerus that articulates with the ulna is the medial epicondyle and the trochlea. Without seeing the specific labels A - D, but based on general knowledge of bone - joint anatomy.

Answer:

(No specific option can be given without seeing what A, B, C, D represent in the diagram. But the relevant part of the humerus is the distal - end structures like the trochlea and medial epicondyle that interact with the ulna.)