A box is placed on a flat surface. Jane lifts one end of the surface, making an angle with the floor. As she increases the angle that the surface makes with the floor, the box eventually begins to slide down because ...
A - only coefficient of static friction decreased
B - only normal force exerted by the board decreased
C - component of the gravitational force parallel to the plane increased, coefficient of static friction decreased and normal force exerted by the board decreased
D - component of the gravitational force parallel to the plane increased and normal force exerted by the board decreased
E - only component of the gravitational force parallel to the plane increased
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