Assertion : Consciousness is considered as the defining property of living organisms. Reason : All organisms, from the prokaryotes to the most complex eukaryotes can sense and respond to environmental stimuli.

• 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.