The correct response that explains why compact fluorescent bulbs can produce as much light as incandescent bulbs while using less energy is: Fluorescent bulbs produce other forms of energy, too, including heat.
This indicates that incandescent bulbs waste a significant amount of energy in the form of heat rather than using it to produce light. In contrast, compact fluorescent bulbs are designed to be more efficient, converting a larger portion of the energy they consume into visible light rather than heat.