(C) The main cause of the ozone hole was found to be gases that contained Chlorofluorocarbons (CFCs),Halon s and Freon s. Found commonly in aerosol cans and released by many electronic appliances, these were seen to decrease the level of ozone in the stratosphere. All of these gases contain chlorine, which is a major cause behind the thinning of the ozone layer. The presence of chlorine within CFC’s break down the ozone gases in the ozone layer which increases the chances of ozone depletion. Till date, CFC’s haveaccounted for about 80% ofozone depletion.