Assertion: In higher category there is great difficulty of determining the relationship to other taxa at the same level.
Reason: In higher-taxa there are less characteristics that the members within the tax share.
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.