As dna is replicated, which dna base pair will bond to cytosine? adenine thymine cytosine guanine

The correct answer would be guanine.

It can be explained with the help of base-pair complementary rule which states that adenine will always base-pair with thymine and guanine will always base-pair with cytosine.  

Adenine bonds with thymine through two hydrogen bonds and guanine bonds with cytosine through three hydrogen bonds.

i think this picture will you.