MULTIPLE CHOICE, general chem question

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to water and carbon dioxide. The mole ratio of H2O to CO2 is 1.125:1.000. The hydrocarbon could be
A) CH4.
B) C2H2.
C) C2H6.
D) C3H4.
E) C4H9.

E) C4H9
2C4H9 + 12.5O2 ----> 9H2O + 8CO2