Air conditioners and fridges involves greenhouse gases which are hydrofluorocarbons. In commercial refrigeration and air conditioning systems carbon dioxide gases is produced.
What is greenhouse gas?
Greenhouse gases trap heat in atmosphere and warm the Earth.
The main gases involved are carbon dioxide, methane, nitrous oxide, water vapors etc. It also involves flourinated gases.
Carbon dioxide is primary greenhouse gas, which is emitted by human activities.
Thus, option A is correct.
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