Answer:
Option (B)
Explanation:
R-12 is known as the Dichloro-difluoro-methane and it is a colorless gas. It is was earlier used in the refrigerators, vehicles air conditioning, and aerosol spray. The use of this R-12 was found to be depleting the ozone layer which was not a positive effect on the earth. Due to this, the use of this gas was banned and alternative energy resources were used. Its products containing this R-12 gas were not expensive and they were stable enough.
Hence, the correct answer is option (B).