The answer is the fourth one: Brachial vein.
Explanation for each option:
Axillary vein: This vein is formed by the union of the brachial veins and the basilic vein. It is not directly formed by the ulnar veins.
Radial vein: The radial veins are paired veins that run alongside the radial artery. They do not unite with the ulnar veins to form a new vein.
Subclavian vein: This vein is formed by the continuation of the axillary vein, not directly by the ulnar veins.
Brachial vein: The ulnar veins, along with the radial veins, unite to form the brachial veins. Therefore, this is the correct answer.
In summary, the ulnar veins unite to form the brachial vein.
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