Assertion : The spring constant of a spring is k. When it is divided into n equal parts, then spring constant of one piece is k/n. Reason : The spring constant is independent of material used for the spring.

• 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.