Explanation:
Population density correlates with habitability factors: fertile soil, water, moderate climate, and jobs attract settlement, leading to high density in river valleys, coasts, and urban centers.
Assertion (A): Fisher's ideal index satisfies both time reversal and factor reversal tests. Reason (R): Fisher's index is the geometric mean of Laspeyres and Paasche indices. Choose the correct option:
A.A is true, R is false
B.A is false, R is true
C.Both A and R are true, but R is not the correct explanation of A
D.Both A and R are true, and R is the correct explanation of A
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