When an unbalanced force is applied to an object, It will change position; option A.
Forces are agents which cause a change in the position or state of an object.
According to Newton's second law of motion, the change in momentum of a body is directly proportional to the applied force and take place in the direction of the applied force.
The movement or change in position of object is due to unbalanced forces.
When there are unbalanced forces, the object will change position in the direction of the unbalanced force.
In conclusion, unbalanced forces are forces which cause changes in position and state of objects.
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