Carbon footprint is the emission of the greenhouse gases like carbon. Lights should be turned off whenever not in use can help in reducing the carbon footprint. Thus, option A is correct.
What is a carbon footprint?
The carbon footprint is the amount of carbon, methane, and other greenhouse gases emitted due to natural or man-made activities. It is expressed in the terms of carbon dioxide released into the atmosphere.
The lights should be turned off whenever not in use to reduce the emission of the gases that harms the ozone and environment as the light energy release many greenhouse gases.
Therefore, the lights should be turned off whenever not in use to reduce the carbon footprint.
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