GIVING BRAINLIEST ! A group of students wants to build a ramp to move boxes from the floor up to a stage. How can the students reduce the amount of effort needed to push the boxes up the ramp?

(A) by making the ramp as long as possible

(B) by making the ramp’s height and length equal

(C) by building the ramp out of a lightweight material

(D) by covering the ramp’s surface with a soft rubber mat