$\begin{array}{1 1} \text{a. Both Assertion and reason are true and Reason is the correct explanation of Assertion} \\ \text{b. Both Assertion and reason are true, but Reason is not the correct explanation of Assertion} \\ \text{c. Assertion is true, Reason is false.} \\ \text{d. Both Assertion and reason are false.}
\end{array} $
