In which of the following equilibria would the concentrations of the products be increased if the volume of the system were decreased at constant temperature?
A) H2(g) + Cl2(g) 2 HCl(g)
B) 2 CO(g) + O2(g) 2 CO2(g)
C) NO(g) + O2(g) NO2(g) + O2(g)
D) 2 HI(g) H2(g) + I2(g)
E) N2O4(g) 2 NO2(g)