Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion: Ethene on treating with \[B{{r}_{2}}\] in presence of \[NaCl\] forms \[C{{H}_{2}}ClC{{H}_{2}}Br\] and \[C{{H}_{2}}Br-C{{H}_{2}}-Br\]. Reason: This addition involves the formation of free radicals.

• 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 the assertion and reason both are false.
• E. If assertion is false but reason is true.