Calorimetric studies show that the following reaction is exothermic: 2NO₂​(g)→N₂O₄(g) ΔH=−14.1kcal. Based on this information, which one—if any—of the following additional changes would increase the molar concentration at equilibrium of N₂O₄(g)?

a) Decrease in pressure
b) Increase in temperature
c) Decrease in concentration of NO₂​(g)
d) Stirring the reaction mixture
e) None of the above