Assertion: Classification systems have undergoes several changes over a period of time.
Reason: This happened, because the criteria for classification get changed gradually.
A. If both assertion and Reason are true and the reason is a correct explanation of the assertion.
B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion and Reason are False.