Solution
Correct Answer: Option D
The principal organic acids found in grapes are tartaric, malic, and to a small extent, citric. Many other organic acids, including amino acids, are also found in juice and wines, but tartaric and malic acid account for over 90% of the total acids present.
The quantity of citric acid found in grapes is small, it still makes up 5% of the total acid content in grapes