Responsible for Depletion of Ozone Layer:The correct answer is (d) Freons.Explanation:Ozone is a gas that is present in the Earth's upper atmosphere, also known as the stratosphere. The ozone layer is responsible for absorbing most of the harmful ultraviolet radiation from the sun. However, over the past few decades, the ozone layer has been depleting at an alarming rate. The depletion of the ozone layer is attributed to human activities and certain chemicals that are released into the atmosphere.The major chemical responsible for depleting the ozone layer is chlorofluorocarbons (CFCs), which are commonly used in refrigeration, air conditioning, and aerosol sprays. CFCs are a type of halogenated hydrocarbon that contains carbon, chlorine, and fluorine. When CFCs are released into the atmosphere, they rise to the stratosphere, where they are broken down by ultraviolet radiation. This process releases chlorine atoms, which then react with ozone molecules, breaking them apart and reducing the amount of ozone in the atmosphere.Other chemicals that can contribute to ozone depletion include:1. Hydrochlorofluorocarbons (HCFCs)2. Halons3. Methyl bromideThese chemicals contain halogens, which are a group of elements that includes chlorine, bromine, and fluorine. When halogens are released into the atmosphere, they can react with ozone and break it down.Conclusion:In conclusion, the depletion of the ozone layer is primarily caused by human activities and the release of certain chemicals into the atmosphere. These chemicals include CFCs, HCFCs, halons, and methyl bromide. Of these chemicals, CFCs are the most harmful and have been banned in many countries. The depletion of the ozone layer has serious consequences for the environment and human health, including increased risk of skin cancer and other health problems. It is important to continue to monitor the state of the ozone layer and take steps to reduce the use of harmful chemicals.