Matthew is trying to push a large across the gym. Although Matthew is exerting a force, the box does not move. What keeps the box from moving even though Matthew is pushing on it?

A The normal force is pushing against Matthews force
B The force of gravity is opposed to the force exerted
C The equal and opposite force of friction prevents the box from moving
D The force Exerted by Matthew on the box is not in the right direction to move the box