Purines Have ____ Ring(s), (Each) Containing _____ Nitrogen(s), Whereas Pyrimidines

Multiple Choice

Purines have ____ ring(s) , (each) containing _____ nitrogen(s) , whereas pyrimidines have _____ ring(s) , (each) containing _____ nitrogens.

A) 1; 1; 1; 1
B) 1; 2; 1; 2
C) 2; 1; 1; 2
D) 2; 2; 1; 1
E) 2; 2; 1; 2