Assertion: In nature, recycling of carbon is essentially self regulating, feedback system.Reason: The reservoir pool of carbon consists of free $CO_2$ in the atmosphere.

Question

$\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} $