Answer:
Option C, Ozone layer
Explanation:
The Antarctic Treaty System talks on mineral resources, nuclear testing, tourism activities but do not talk about ozone layer.
In the treaty it was mentioned that
a) Nuclear power will be used only when the parties follow the set standard.
b) Only scientific research on minerals be allowed other than this all activities on minerals must be prohibited.
c) The ATS provided specific guidelines in terms of tourism activities in the Antarctica region.
Hence, option C is correct.
