Assertion. Nucleotides are the building blocks of nucleic acid. Reason. Nucleotides are also components of energy carriers and coenzymes. A.If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion. B.If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C.If Assertion is true but the Reason is false. D.If both Assertion and Reason are false.