Which letter in the diagram corresponds to the transformation to sulphuric acid and nitric acid?

Sulphuric Acid

A highly corrosive, dense, and oily liquid chemical used in various industrial processes, including fertilizer production and mineral extraction.

Nitric Acid

A highly corrosive mineral acid with the formula HNO3, widely used in the production of fertilizers and explosives.

Transformation

A marked change in form, nature, or appearance, often used in the context of biological processes, social change, or technology development.