Jorge is asked to build a box in the shape of a rectangular prism. Its height will be 2 cm more than its width. The sum of the length, width, and height is 20 cm. Use a graphing calculator to find the width, rounded to the nearest tenth of a cm, that will give Jorge’s box the largest possible volume.
A 2.7 cm

B 5.7 cm

C 6.0 cm

D 9.0 cm