Ozone-layer is getting depleted because of (a) excessive use of automobiles (b) excessive formation of industrial units (c) excessive use of man-made compounds containing both fluorine and chlorine (d) excessive deforestation.

Soln:

Answer is (c) excessive use of man-made compounds containing both fluorine and chlorine

Explanation:

Carbon and fluorine reacts with ozone to convert it into oxygen. This results in thinning of ozone lays which is called as ozone depletion.