Question

at its proximal end, the round head of the humerus articulates with the ____________. answer radius clavicle scapula ulna i dont know yet

Explanation:

The proximal end of the humerus (upper - arm bone) forms a ball - and - socket joint with the scapula (shoulder blade). The round head of the humerus fits into the glenoid cavity of the scapula. The radius and ulna are forearm bones, and the clavicle is the collarbone which does not articulate with the head of the humerus at its proximal end.

Answer:

C. scapula