Which of the Following Statements About Sulfur Is Incorrect

Which of the following statements about sulfur is incorrect?

A) The complete combustion of sulfur produces sulfur trioxide as the major product.
B) In the Frasch process,underground deposits of sulfur are melted and forced to the surface under pressure.
C) In the first step of the contact process,sulfur trioxide is produced from sulfur dioxide and oxygen using a vanadium catalyst.
D) Sulfur dioxide produced from the combustion of fossil fuels has been implicated in respiratory ailments.
E) In the Claus process,free sulfur is obtained by the partial burning of hydrogen sulfide.