Consider the acidity of the carboxylic acids :
`(i) PHCOOH" "(ii) o-NO_(2)C_(6)H_(4)COOH" "(iii) p-NO_(2)C_(6)H_(4)COOH" "(iv) m-NO_(2)C_(6)H_(4)COOH`
A. `I gt ii gt iii gt iv`
B. `ii gt iii gt iv gt i`
C. `iii gt ii gt iv gt i`
D. `ii gt iv gt iii gt i`