Separating Lead, Copper, Zinc, and Iron from the Sulfur Atoms

Multiple Choice

Separating lead, copper, zinc, and iron from the sulfur atoms produces sulfuric acid as a by-product. Why is this a problem?

A) Sulfuric acid is useless and yields no profit.
B) Sulfuric acid, when released into the atmosphere, combines with vapor to produce acid rain.
C) Sulfuric acid is extremely profitable, but not in the form it is produced through this process.
D) Lead, copper, zinc and iron are wasted in producing sulfuric acid, which is more profitable.