Explanation
The correct answer is (c) Refrigeration systems.
CFCs (chlorofluorocarbons) are synthetic compounds that contain chlorine, fluorine, and carbon atoms. They were commonly used in various applications, such as refrigeration and air conditioning systems, foam-blowing agents, aerosol propellants, and in the production of certain plastics.
CFCs are released into the atmosphere primarily through the use and disposal of products that contain them. Among the options you provided, refrigeration systems are the main source of CFC emissions. When refrigeration systems that use CFCs as refrigerants leak or are improperly disposed of, the CFCs can be released into the environment.
Burning of wood (option a) and burning of paper (option d) do not generate CFCs. These activities can release other pollutants into the atmosphere, but CFCs are not directly associated with them.
Garbage dumping (option b) can release methane and other greenhouse gases, as well as other pollutants, but it is not a significant source of CFC emissions.
Therefore, the correct answer is (c) Refrigeration system.
