Assertion : The essence of Darwinian theory about evolution is natural selection.
Reason : Branching descent and natural selection are the two key concepts of Darwinian theory.
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 both assertion and reason are false