Concept:CFCs are chemical compounds used mainly as refrigerants, propellants, and in some fire extinguishing agents.
They are not used in ordinary grinding tools.
Explanation:CFCs were commonly used in aerosol sprays as propellants.
CFCs were widely used in refrigerators and air conditioners as refrigerants.
Older fire extinguishers used halons, which are chemically related to CFCs.
A grinder is a mechanical tool used for cutting, grinding, or shaping materials.
Grinders do not need refrigerants or propellants, so CFCs are not used in them.
Hence, the correct logical answer is Grinders.
Note: The official answer key mentions Fire extinguishers, but scientifically CFCs have been used in fire extinguishers.
Answer:Grinders