Assertion : Atmospheric nitrogen gas is always fixed by nitrogen-fixing micro-organisms. Reason : Decomposers release nitrogen gas from dead bodies of plants and animals.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false