Acetic acid can be halogenated in presence of phosphorus and chlorine. Formic acid cannot be halogenated with same way because of
A. presence of `alpha`- H atom in formic acid
B. presence of `alpha`- H atom in acetic acid
C. absence of `alpha` - H atom in `CH_(3)COOH`
D. higher acidic strength of acetic acid than formic acid.