Carl uses energy from a fully charged battery pack to light up a high efficiency light bulb, which converts about 80\%80%80, percent of its electrical energy into light. After an hour, the battery pack is no longer full. He also notices that the temperature of air near the light bulb has risen slightly. What happened to the energy from the battery pack?
(Choice A)
A
It mostly transformed into light energy, and a small portion disappeared.

(Choice B)
B
It transformed into light energy and thermal energy in equal portions.

(Choice C)
C
It mostly transformed into light energy, and a small portion transformed into thermal energy.

(Choice D)
D
It mostly transformed into heat, and a small portion transformed into light energy.