A table of wrong height can put strain on which body part?

Correct answer: Neck and shoulders

The direct answer is A: a wrongly high or low table can strain the neck and shoulders. Ergonomics means arranging furniture and work so that the body can work safely, comfortably, and efficiently. If a table is too high, a person may raise the shoulders and bend the neck; if it is too low, the person may bend forward for a long time. These awkward postures can cause muscle tiredness, stiffness, and pain. Option A is correct because the neck and shoulders commonly carry strain from poor desk height and posture. Option B is wrong because hair is not a load-bearing joint or muscle group affected in this ergonomic way. Option C is wrong because nails are not the main body area strained by table height. Option D is wrong because teeth are not normally strained by an incorrectly sized table. The exact effect can vary, and the back or arms may also be affected, but among these options A is the relevant answer. Memory cue: desk height affects posture; poor posture often reaches the neck and shoulders.