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The correct answer is option (c).
Explanation⬇️
The Vienna Convention, adopted in 1985, and the Montreal Protocol, adopted in 1987 is a multilateral environmental agreement for the protection of the ozone layer.
The objective is to protect the environment from the harmful effects of the depletion of ozone layer through worldwide control and reduction of usage and production of ozone depleting substances (ODSs).
ODSs include chlorofluorocarbons (CFCs), bromine containing halons and methyl bromide, hydrochloro fluoro carbons (HCFCs), carbon tetrachloride (CCl4), and methyl chloroform.
The Montreal Protocol’s control of ODSs stimulated the development of replacement substances, firstly hydrochlorofluorocarbons (HCFCs) and then hydrofluorocarbons (HFCs), in a number of industrial sectors. While HFCs have only a minor effect on stratospheric ozone, some HFCs are powerful greenhouse gases (GHGs).
Therefore, option (c) is the correct answer.

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The correct answer is option (a).