Rank the Following Compounds in Order of Increasing Acidity, Putting

Multiple Choice

Rank the following compounds in order of increasing acidity, putting the least acidic first. $$\begin{array} { c c c c } \mathrm { CH } _ { 3 } \mathrm { COOH } & \mathrm { FCH } _ { 2 } \mathrm { COOH } & \mathrm { ClCH } _ { 2 } \mathrm { COOH } & \mathrm { BrCH } _ { 2 } \mathrm { COOH } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$$

A) I < IV < III < II
B) I < III < IV < II
C) II < III < IV < I
D) II < IV < III < I