Assertion: Trans-`2`-butane on reaction with `Br_(2)` gives meso-`2,3-`dibromobutane.
Reason: The reaction involves syn-addition of bromine.
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 and the reason is the correct explanations of the assertion
C. If the assertion is true but reason is false
D. If assertion is false but reason is true.