Propane combusts according to the balanced equation C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l). The standard entropy change for this reaction is negative. Which of the following single modifications would most likely make the entropy change less negative (i.e., shift it toward a positive value)?
a) Doubling every coefficient in the balanced equation
b) Changing the physical state of the water produced to H2O(g)
c) Decreasing the coefficient on O2 from 5 to 4 while keeping other coefficients unchanged
d) Changing the physical state of the CO2 produced to CO2(s)