The box experiences unbalanced forces if it is moving in either direction (to the left or to the right). It experiences balanced forces if it is not moving at all (staying at rest).
So, if the box is moving to the left, the correct response would be: Unbalanced forces and it moves to the left. If it is moving to the right, the correct response would be: Unbalanced forces and it moves to the right. If it is not moving, the answer would be: Balanced forces and it doesn’t move.
Based on your options, please clarify the situation (i.e., is it moving or not and in which direction) to choose the correct response.