Which of the Following Best Defines Energy Efficiency

Multiple Choice

Which of the following best defines energy efficiency?

A) measures how much of the original energy goes to its intended purpose.
B) the goal for modern society as we transition away from our dependence on fossil fuels.
C) the minimum standard for new appliances.
D) measures the reduction in energy usage for a given application.
E) compares the amount of fossil fuel to renewable energy usage.