Nucleophilicity Questions

For the following anions: (i) ${\text{I}}^{-}$, (ii) ${\text{Cl}}^{-}$, (iii) ${\text{Br}}^{-}$. (Question implies adding (iv) ${\text{F}}^{-}$ based on options). The increasing order of nucleophilicity in a polar protic solvent would be: