A
A nation or region situated downstream along a river system relative to others
B
A coastal area where a river meets the sea or ocean
C
An administrative zone regulating interstate water tribunals
D
A nation or region situated upstream along a river system relative to others
Correct answer: (d) A nation or region situated upstream along a river system relative to others
Explanation
Option D is correct as an upper riparian state refers to a nation or region situated upstream along a river system relative to others. Options A, C, and D describe entirely different geographical or administrative concepts.
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