Concept:Energy conservation in homes means reducing electricity use by choosing appliances that use less power for the same brightness.Explanation:Using energy-efficient LED light bulbs is effective because they use less electricity than ordinary bulbs and produce the same amount of light.Turning off lights in empty rooms and avoiding unnecessary daytime lighting also save energy, but the best option is replacing regular bulbs with LED bulbs.Leaving lights on or keeping them on during the day wastes energy.Answer:B. Using energy-efficient LED light bulbs