Correct acidic strength of the following carboxylic acids
$\begin{array}{l}\mathrm{A}) {\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}\\ \mathrm{B}) \mathrm{o}-{\mathrm{NO}}_2\left({\mathrm{C}}_6{\mathrm{H}}_4\right)\mathrm{COOH}\\ \mathrm{C}) \mathrm{p}-{\mathrm{NO}}_2\left({\mathrm{C}}_6{\mathrm{H}}_4\right)\mathrm{COOH}\\ \mathrm{D}) \mathrm{m}-{\mathrm{NO}}_2\left({\mathrm{C}}_6{\mathrm{H}}_4\right)\mathrm{COOH}\end{array}$