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In which one among the following is the best definition of the tropics?

[A].	Tropics are useful for fixing the boundaries of the world's climatic zones	[B].	Tropics are useful for fixing the length of day in a year
[C].	Tropics represent the pole ward limits of the world's densely populated zones	[D].	Tropics represent the pole ward limits of the migration of the sun's verticle rays

Answer: Option A