A group of students were setting up their school auditorium for a rock concert to be held over the weekend.

The students used a ramp to get one of the large speakers onto the stage. The students know that Work = Force x Distance. Which of the following BEST explains the advantage of using the ramp instead of lifting the speaker onto the stage?

a
The mass of the speaker is reduced by using the ramp.
b
The amount of work done is decreased by using the ramp.
c
More energy is created by using the ramp
d
Less force is required by using the ramp.