A. size
B. defence
C. population
D. homogeneity

Correct Answer: Option D

D. homogeneity

Explanation

Different groups within a country may adopt federalism as a means of preventing the over-concentration of power at the centre. This is one way in which they can prevent the country from drifting into dictatorship. States with a common historical background can come together to form a federation.

Homogeneity is the quality or state of being all the same or all of the same kind.

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