A gas grill works according to the combustion of propane gas (C3H8) to produce heat and flames:

C3H8+502>3CO₂ + 4H₂O

One day after grilling you forget to turn the gas off. In the morning you check the grill, and the flame has gone out and is no longer hot. Which reactant must be the limiting reactant?

a. 02
b. H2O
c. C3H8
d. CO2