Caffeine Consists of Carbon, Hydrogen, Oxygen, and Nitrogen

Caffeine consists of carbon, hydrogen, oxygen, and nitrogen. When 0.1920 g of caffeine is burned in an excess of oxygen, 0.3482 g of carbon dioxide and 0.0891 g water are formed. Caffeine is 28.84% nitrogen by mass. Its molar mass is between 190 and 200 g/mol. What is the formula for caffeine?

A) C₆H₄N₄O₄
B) C₈H₁₀N₄O₂
C) C₄H₅N₂O
D) C₃H₂N₂O₂
E) none of these