The correct option is A directly propotional to strength of EWG
Acidic strength of an acid is always directly propotional to strength of EWG as EWG stabilises the negative charge on conjugate base that acid and inversly propotional to strenth of an EDG. The more strong EWG will be, more acidic the compound will become.
Acidic strength of an acid is inversly propotional to strength of its conjugate base. The more stronger conjugate base, less acidic the compound is.