Correct Answer - B
Citric acid is a tricarboxylic acid.
`underset("Oxalic acid")underset(COOH)underset(|)underset(COOH)underset("Citric acid")underset(OH)underset(|)overset(COOH)overset(|)(HOOC-CH_(2)-C-CH_(2)-COOH)`
`HOOC- underset("Succinic acid")(CH_(2)-CH_(2))-COOH`
`underset("Adipic acid")(HOOC-(CH_(2))_(2)-COOH)`