Assertion: The standard unit for expressing the mass of atom is a.m.u.
Reason: a.m.u. stands for mass of 1 atom of carbon.
(a) If both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.
(b) If both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion.
(c) If assertion is CORRECT, but reason is INCORRECT.
(d) If assertion is INCORRECT but reason is CORRECT.
(e) If both assertion and reason are INCORRECT
