Thymine is held by two hydrogen bonds with the base

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guanine

cytosine

thymine

adenine

answer is D.

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Detailed Solution

First, we note that DNA contains thymine whereas RNA does not. Adenine, guanine, cytosine, and thymine are the bases that are found in DNA. Adenine and thymine are bound together by hydrogen bonds and are two of these, making them complimentary. The bonds between cytosine and guanine are similar. D is accurate, thus.

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