When_____forces act on an object, they cause the object to move.

A. Balanced
B. Unbalanced
C. friction
D net

B?

correct

Yes, the correct answer is B. Unbalanced forces.

Explanation:
When unbalanced forces act on an object, they cause the object to move. Unbalanced forces are forces that are not equal in size or opposite in direction, resulting in a net force acting on the object. This net force accelerates the object in the direction of the greater force. If the forces are balanced (equal in size and opposite in direction), then the object will not move or will move at a constant velocity. Friction (option C) is a force that opposes motion and can either be balanced or unbalanced depending on the situation.