Compound X?

Sep 2015
How do you go about solving this problem? what steps should I take? Thank you very much for any help!

11. When 3.14 g of Compound X is completely combusted, 6.91 g of CO2 and 2.26 g of H2O form. The molecular formula of Compound X is
a. C7H16
b. C6H12O
c. C5H8O2
d. C4H4O3