Concept:A "heavy chemical" is one that is manufactured in exceptionally large quantities, i.e., a high tonnage per year, because it is a bulk raw material for many industries.
Explanation:Tetraoxosulphate (VI) acid is
H2SO4, commonly called sulphuric acid.
It is classified as a heavy chemical because it is produced and consumed in millions of tonnes every year.
Its classification has nothing to do with its relative molecular mass, being inorganic, or the fact that it is used to make heavy chemicals.
Instead, the very high annual production tonnage makes it a heavy chemical.
Industries such as fertilizer, dye, and explosives production rely on this massive daily output.
Therefore, among the given options, the correct reason is the scale of production.
Answer:B. a high tonnage is produced every year