The correct option is B AgNO3+NaCl→AgCl+NaNO3
Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.
In option (ii), Ag+ ion combines with Cl− ion and NO−3 ion combines with Na+ ion to form two new compounds as silver chloride (AgCl) and sodium nitrate (NaNO3) respectively.