(C) The correct answer is $C$. Each upper arm or brachium of mammals contains a single long bone known as the $Humerus$. The proximal end of the $Hume

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(C) The correct answer is $C$. Each upper arm or brachium of mammals contains a single long bone known as the $Humerus$. The proximal end of the $Humerus$ is swollen,spherical,and smooth,forming the 'head' of the bone. This head fits into the glenoid cavity of the pectoral girdle to form the shoulder joint.