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Dear student
Option d is the correct answer.
Muscle Q is biceps and Muscle P is triceps.
Movement is caused by contaction of biceps and relaxation of triceps.
Biceps and triceps are two sets of muscles located on upper arm. Biceps are located on the front of upper arms and crosses both the shoulder and elbow. Triceps are located at the back of upper arm where they cross the lower part of shoulder and at the end of elbow. Biceps helps in flexing the arm whereas triceps work with the back muscle.
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