To solve this problem, we need to identify the purpose of the Montreal Protocol signed in 1987. Let's analyze the options:$\newline \bullet$Option 1: Emission of ozone depleting substances$\newline$ - The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion.$\newline$ - This treaty specifically targets substances like chlorofluorocarbons (CFCs) and halons, which are known to deplete the ozone layer.$\newline$ - Therefore, this option correctly describes the purpose of the Montreal Protocol.$\newline \bullet$Option 2: Release of Green House gases$\newline$ - The Montreal Protocol is not primarily focused on greenhouse gases, although some ozone-depleting substances are also greenhouse gases.$\newline$ - The primary focus is on substances that harm the ozone layer, not on climate change.$\newline \bullet$Option 3: Disposal of e-wastes$\newline$ - The Montreal Protocol does not address the disposal of electronic wastes.$\newline$ - This is unrelated to the treaty's objectives.$\newline \bullet$Option 4: Transport of Genetically modified organisms from one country to another$\newline$ - The Montreal Protocol does not concern itself with the transport of genetically modified organisms.$\newline$ - This is outside the scope of the treaty.$\newline$Based on the analysis, the correct option is:$\newline$Option 1: Emission of ozone depleting substances$\newline$This corresponds to the correct option, which is Option 1.