Ethan pushes a wooden box across a carpeted floor. then he pushes the same box across a smooth marble floor. why does ethan find it easier to push the box on the marble floor than on the carpeted floor?

a. the box experience more friction on the carpeted floor
b. the box experience less friction on the carpet floor
c. the box experiences more applied force on the marble floor
d. the box experiences less normal force on the marble floor