Final answer:
The answer that is not an example of energy efficiency is: all are examples of energy efficiency.
Step-by-step explanation:
The answer that is not an example of energy efficiency is: all are examples of energy efficiency. LED light bulbs, energy star appliances, and hybrid vehicles are all examples of energy efficiency. LED light bulbs, for example, use significantly less energy than traditional incandescent light bulbs and have a longer lifespan, making them more energy efficient. Energy star appliances are designed to use less energy and help reduce electricity consumption. Hybrid vehicles combine an internal combustion engine with an electric motor to increase fuel efficiency and reduce emissions.