Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion: Melting point of n-butane is higher than propane. Reason: It is called oscillation effect.

• 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.