Answer:
b. shaft of the bone closest to the elbow joint.
Explanation:
In medicine proximal is defined as "Toward the beginning, the nearer of two (or more) items, nearest the trunk or the point of origin" and diaphysis is defined as "the main or midsection (shaft) of a long bone".
Considering these definitions we can conclude that the correct answer is b. shaft of the bone closest to the elbow joint because the elbow is closer that the shoulder to the trunk and diaphysis refers to the shaft.
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