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'Saving energy and other resources for the future without sacrificing people's comfort in the present' is the definition of which of the following concepts?

'??????? ??? ????? ?? ???? ?? ????? ??? ???? ?????? ?? ??? ????? ?? ???? ???????? ?? ???' ?????????? ??? ?? ??? ??????? ?? ??????? ???

[UPPSC 2018 GS P1]
A
B
C
D