Which combination of temperature and pressure will give the greatest yield of sulfur trioxide?

     ${\text{2S}}{{\text{O}}_{\text{2}}}{\text{(g)}} + {{\text{O}}_{\text{2}}}{\text{(g)}} \rightleftharpoons {\text{2S}}{{\text{O}}_{\text{3}}}{\text{(g)}}$     $\Delta H =  - 196{\text{ kJ}}$

B