The descending order of acidity for the following carboxylic acid is :
A. $\mathrm{CH}_3 \mathrm{COOH}$
B. $\mathrm{F}_3 \mathrm{C}-\mathrm{COOH}$
C. $\mathrm{ClCH}_2-\mathrm{COOH}$
D. $\mathrm{FCH}_2-\mathrm{COOH}$
E. $\mathrm{BrCH}_2-\mathrm{COOH}$
Choose the correct answer from the options given below: