Conjugate base for Bronsted acids $H_2O$ and HF are:-

Question

( A ) $H_3O^+$ and $H_2F^+$, respectively
( B ) $H_3O^+$ and $F^-$, respectively
( C ) $OH^-$ and $H_2F^+$ respectively
( D ) $OH^ -$ and $F^-$, respectively