The exercise that will help increase arm strength is pull-ups. The correct option is B.
What is exercise?
Exercise is the physical movement of the different body parts to strengthen them and maintain body weight. Exercise is an important part of life, and to carry on a healthy life, exercise is a must.
Pull-ups are the exercise where the body is pulled up by the arms. It strengthens the arms.
Thus, option B, pull-ups, is correct regarding arm strength.
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