2c2h6+7o2 = 4co2+6h2o What is the molar ratio would you use if you have 2.9 mol O2 and you wanted to know how many moles of CO2 it would make?

Is it:
A = (2 mol C2H6) / (7 mol O2)

B = (7 mol O2 )/ (4 mol CO2)

C = (4 mol CO2) / (7 mol O2)

D = (1 mol CO2) / (2.9 mol O2)