(B) In the structure of $DNA$,nitrogenous bases pair specifically according to Chargaff's rules. Adenine $(A)$ always pairs with thymine $(T)$ via two

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(B) In the structure of $DNA$,nitrogenous bases pair specifically according to Chargaff's rules. Adenine $(A)$ always pairs with thymine $(T)$ via two hydrogen bonds,while guanine $(G)$ pairs with cytosine $(C)$ via three hydrogen bonds. Therefore,adenine is connected to thymine by two hydrogen bonds.