The correct statement that describes an object acted on by balanced forces is:
A bus is stopped at a station waiting to pick up passengers.
In this scenario, the forces acting on the bus are balanced; the forces that keep the bus stationary, such as friction and the brakes, are equal and opposite to any forces trying to move it.
The other options describe scenarios where there are unbalanced forces acting on the objects, causing them to accelerate or decelerate.