Which ingredient would a company that makes super-sour candy most likely use in large quantities?

The correct answer for the question is C) Citric acid (C6H8O7)

According to the property of acid and base, acids are sour in taste and bases are bitter in taste. Citric acid ( C6H8O7) is a weak organic acid that is naturally found in citrus fruits (like orange). It is used as an ingredient to make super sour candies.

Thus, a company would most likely use citric acid in large quantities so as to make super sour candies.