The graph below shows the relationship between ramp height and the force needed to move an object.
Based on the graph, which of the following statement is correct?
A As the height of the ramp increases, the force needed decreases.
B As the height of the ramp increases, the force needed increases.
C As the height of the ramp increases, the force needed remains the same.
D As the height of the ramp increases, the force needed halves.