Formulation of `SO_(3)` takes place according to the reaction
`2 SO_(3) + O_(2) hArr 2 SO_(3), DeltaH=-45*2 " kcal "`
Which of the following factors favours the formulation of `SO_(3)` ?
A. Increase in temperature
B. Increase in pressure
C. Removal of oxygen
D. Increase in volume