Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion : Smaller the orbit of the planet around the sun, shorter is the time it takes to complete one revolution. Reason : According to Kepler?s third law of planetary motion, square of time period is proportional to cube of mean distance from sun.

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
• C. If assertion is true but reason is false.
• D. If the assertion and reason both are false.
• E. If assertion is false but reason is true.