Answer: Option (B) is the correct answer.
Step-by-step explanation:
DNA means deoxyribonucleic acid which helps in determining the characteristics of a living thing. Base pairs present a DNA molecule are adenine, guanine, thymine and cytosine.
The complemetary base pair of adenine is thymine and vice-versa.
Whereas the complementary base pair of guanine is cytosine and vice-versa.
Thus, we can conclude that out of the given options cytosine and guanine are the correct base pairs of DNA.