Read the excerpt from the introduction for "On Becoming an Inventor" by Dean Kamen.

I had just finished making a complicated piece of equipment that was to be used for a show opening in Philadelphia called "Fiorello." When the machine arrived they had trouble wiring it, so instead of going off to college that morning for an orientation, I spent several days at the theater fixing my light/sound equipment. The show received poor reviews, except for the mention by one reviewer of the "special effects," which, he wrote, were "outstanding."

Which detail from the excerpt proves that Dean created very good light/sound equipment?

A. He made a piece of equipment for a show named "Fiorello."
B. The show's crew had trouble wiring the equipment.
C. Dean spent several days at the theater fixing the equipment.
D. The equipment got great reviews, even though the show did not.