The Covalent bond is responsible for the existence of the sugar-phosphate backbone of DNA. Thus, the correct option is A.
DNA stands for Deoxyribonucleic acid. It may be defined as a molecule that is present in the cells of an organism that carries genetic information responsible for the development and function of an organism.
The existence of the sugar-phosphate backbone of DNA is accomplished with the help of phosphodiester bonds that are classified under covalent bonds.
Therefore, the correct option for this question is A.
To learn more about the Backbone of DNA, refer to the link:
https://brainly.com/question/4145808
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