Answer:
The correct answer will be adenine, guanine, cytosine and thymine.
Step-by-step explanation:
Strand of DNA is made up of nucleotide monomers. Each nucleotide is made up of a 5C sugar (deoxyribose), a phosphate group and four nitrogenous bases (adenine, guanine, cytosine and thymine).
Sugar and phosphate form the backbone of the DNA molecule while nitrogenous bases are attached perpendicular to the backbone bonded to a complementary base on another strand by a hydrogen bond.
Thus, adenine, guanine, cytosine and thymine is the correct answer.