Assertion : For a perfectly diamagnetic substance permeability is always one. Reason : The ability of a material of permit the passage of magnetic lines of force through it is called magnetic permeability.

• 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.