What type of force does a backpack exert on the body’s back and hips? a)tension b)compression c)flexion d)extension

A backpack exert compression on the body’s back and hips. Correct B  

Backpack can cause excessive strain in one's neck, back and shoulders if it is heavy and if it is worn for a long time. The weight's force can pull you backward. In order to compensate for the force we bend forward at the hips or arch our back and this causes the spine to compress unnaturally.

B)compression

Explanation:

By carrying backpack can exert some severe pressure on the lower area of the body , i.e. , back and hips .

The straps of the bag are responsible to carry all the load and hence can lead to stress and strain in the upper area of the body , i.e. , shoulders , back and neck .

The excessive use of backpack for a long period of time , an make you pull backward due to the heavy load and therefore , in order to balance the force the body bends forward , which lead to the compression of the spin .

answer; i believe the correct answer is (secondary prevention);