Consider the acidity of the carboxylic acids:
(1) `PhCOOH`
(2) `o-NO_(2) C_(6) H_(4) COOH`
(3) `p-NO_(2) C_(6) H_(4) COOH`
(4) `m-NO_(2) C_(6) H_(4) COOH`
Which of the following order is correct?
A. igtiigtiiigtiv
B. iigtivgtiiigti
C. iigtivgtigtiii
D. iigtiiigtivgti