The correct order of increasing acid strength of the compounds

(A) ${\mathrm{CH}}_3{\mathrm{CO}}_2\mathrm{H}\text{, }$

(B) ${\mathrm{MeOCH}}_2{\mathrm{CO}}_2\mathrm{H}$

(C) ${\mathrm{CF}}_3{\mathrm{CO}}_2\mathrm{H}$ and 

(D)

is 

The electron releasing group decreases the acid strength while the electron attracting group increases the acid strength.

The correct order of increasing the acid strength of the compound is D < A < B < C .