Structure of nucleic acids and replication of DNA — practice question

Which row gives the correct description of cytosine?

• Aring structure: double; number of hydrogen bonds it forms with its complementary base: three; type of base: purine
• Bring structure: double; number of hydrogen bonds it forms with its complementary base: two; type of base: pyrimidine
• Cring structure: single; number of hydrogen bonds it forms with its complementary base: three; type of base: pyrimidine
• Dring structure: single; number of hydrogen bonds it forms with its complementary base: two; type of base: purine