Assertion: Nitrogen fixing enzyme in legume root nodules functions at low oxygen concentration <br> Reason: Low oxygen concentration

Question

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