What is the major product when benzoic acid reacts with sulphuric acid and sulphur trioxide?

o-Sulphobenzoic acid m-Sulphobenzoic acid p-Sulphobenzoic acid o,p-Sulphobenzoic acid

m-Sulphobenzoic acid

Benzoic acid reacts with sulphuric acid and sulphur trioxide to produce m-Sulphobenzoic acid.