Why are incandescent light bulbs considered to be lower efficiency than LED bulbs?

Question

A.) A smaller amount of energy is wasted by the incandescent bulb.

B.) A smaller percentage of the energy output of the LED bulb goes toward light.

C.) A greater percentage of the energy output of the incandescent bulb goes toward heat.

D.) A greater amount of energy is required for the same light output from the LED bulb.

Answer 1

C.) A greater percentage of the energy output of the incandescent bulb goes toward heat.