Why does cytosine not form a bond with adenine...? Mcqs

Why does cytosine not form a bond with adenine...?

(A) Cytosine is unable to form hydrogen bonds with adenine.

(B) Adenine and cytosine have incompatible hydrogen bond donors and acceptors.

(C) Cytosine only pairs with thymine due to their complementary structures.

(D) Adenine is a pyrimidine and cannot bond with cytosine.