Citrus fruit with highest malic acid content is

Answer: Option B

Citrus fruit with the highest malic acid content is Sweet lime.
Although apples are the wealthiest source of malic acid, among the citrus fruits, malic acid was the dominant acid in sweet lime.
Lime gives a drink a different kind of sourness since it contains not only citric acid but also malic acid and a small but significant amount of succinic acid, each of which adds something different.