For the chemical equation SO2(g) + NO2(g) ⇌ SO3(g) + NO(g), the equilibrium constant at a certain temperature is 2.60. At this temperature, calculate the number of moles of NO2(g) that must be
a. Decreased by 1 mole
b. Increased by 0.5 moles
c. Decreased by 0.5 moles
d. Increased by 1 mole