(C) Population
"Population" is not a Sustainable Development Goal (SDG) of the United Nations. The 17 SDGs include Clean Water and Sanitation (Goal 6), Gender Equality (Goal 5), and Reduced Inequalities (Goal 10), but Population is not among them.
The UN adopted 17 SDGs in 2015 under the 2030 Agenda for Sustainable Development. Students must remember the actual 17 goals; "Population" is not one of them. The other three options are official SDGs. Note: The source passages provided do not cover this topic — this answer is based on standard CBSE/UN SDG knowledge required at Class 10 level.