Three Different Boxes Are Lifted to Different Heights

Three different boxes are lifted to different heights.
Box X weighs 115 N and is lifted to 15 m.
Box Y weighs 210 N and is lifted to 10 m.
Box Z weighs 305 N and is lifted to 5 m.
Which of the following statements best describes the boxes' change in mechanical energy?

A) Box X had the greatest change in mechanical energy.
B) Box Z had the smallest change in mechanical energy.
C) Boxes X and Y had the same change in mechanical energy.
D) Boxes Y and Z had the same change in mechanical energy.