Which country has the greatest contribution for the hole formation in ozone layer? 

USA

The correct answer is option 3. USA.

Manufacturing-related chemicals, particularly halocarbon refrigerants, solvents, propellants, and foam-blowing agents (chlorofluorocarbons (CFCs), HCFCs, and halons), also known as ozone-depleting compounds, are the primary cause of ozone depletion and the ozone hole (ODS). Several nations, including the United States, Canada, Sweden, Denmark, and Norway, moved to ban the use of CFCs in aerosol spray cans after the United States National Academy of Sciences found that there was solid scientific evidence to support the ozone depletion concept. In 1978, the US outlawed the use of CFCs in aerosol cans. CFC ban plans were rejected by the European Community.