Arm support in a chair can give rest to which part?

Correct answer: Arms and shoulders

Direct answer: Option A is correct. Arm support on a chair can give rest to the arms and shoulders. When the forearms or elbows are supported at a suitable height, some of the weight of the upper limbs is carried by the support instead of being held continuously by the shoulder and back muscles. This can reduce muscular effort during seated work, especially when the chair, desk, and posture are adjusted properly. The support should not force the shoulders upward or press painfully on the elbows. Option A works because it names the body parts directly helped by armrests. Option B is wrong because arm support has no meaningful role in resting hair. Option C is wrong because it does not rest the teeth; teeth need oral care, not chair armrests. Option D is wrong because armrests do not support shoes. The benefit is not that every discomfort disappears, but that suitable support can reduce pressure and improve seated comfort. Memory cue: armrest supports the arm, helping the shoulder relax.