Structure of nucleic acids and replication of DNA — practice question

Which statement gives the correct description of base pairing in a DNA molecule?

• AThe purine adenine forms bonds with the pyrimidine thymine.
• BThe purine adenine forms bonds with the pyrimidine uracil.
• CThe purine cytosine forms bonds with the pyrimidine guanine.
• DThe purine guanine forms bonds with the pyrimidine thymine.