Assertion: The square of the period of r...

Assertion: The square of the period of revolution of a planet is proportional to the cube of its distance from the sun. Reason: Sun's gravitational field is inversely proportional to the square of its distance from the planet.

A. if both assertion and reason are true and reason is the correct explanation of the assertion

B. if both assertion and reason are true but reason is not correct explanation of the assertion

C. if assertion is true, but reason is false

D. if both assertion and reason are false

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