The correct option is B [Ag(NH3)2]+
Tollen's reagent refers to the chemical reagent which is used in the detection of an aldehyde functional group, an aromatic aldehyde functional group, or an alpha hydroxy ketone functional group in a given test substance.
Ketones don't give silver mirror with Tollens' reagent.
Tollen's reagent is ammoniacal solution of silver nitrate
A positive test gives precipitate of elements silver.RCHO+2[Ag(NH3)2]++3OH−→RCOO− + 2Ag↓ + 2H2O+4NH3Aldehyde Tollen's Reagent Carboxylate ion Silver mirror