Answer:
The correct answer will be option-C.
Step-by-step explanation:
DNA is made up of nucleotides which are composed of the five-carbon sugar deoxyribose, a phosphate group and four types of the nitrogenous base.
The nitrogenous base remains perpendicular to the backbone made of the sugar and phosphate. The bases bonds to each other following a rule suggested by the Chargaff.
Chargaff rule stated that purine will bind complementary pyrimidines like adenine will bind thymine and guanine will bind cytosine. Thus, Option-C is the correct answer.