The reading describes "foul-smelling stuff" as coming from:

A. Boils on the cattle.

B. Beef in the cellars.

C. Cans full of meat.

D. Jars full of chemicals.

The foul smelling stuff comes from A. Boils on the cattle. The foul smell comes from an isomer which remains the blood clotted internally. Boils is a disease of cows in which the one of the repercussions is having a bad body smell and odor.