the answer is a. i learned this in biology
what monomers build nucleic acid? how many are there?
all nucleic acids are made up of the same building blocks (monomers). chemists call the monomers "nucleotides." the five pieces are uracil, cytosine, thymine, adenine, and guanine.
( i got that from google, so don't say i copied anyone. we've both just got it from the same place. )
hope this you my friend! : )
the answer to your question is d