Statement (A): Silver exhibits two valency 1 and 2.

Statement (B): Tin exhibits two valency 2 and 4

Statement (C): Iron exhibits two valency 1 and 3.

Among given three statements, A & B are correct but C is incorrect.

Because iron(Fe) shows variable valences 2 and 3 in its compounds.

$\mathrm{Ex}: \mathrm{Fe}\left(\mathrm{II}\right) \mathrm{in} {\mathrm{FeCl}}_2\&\mathrm{Fe}\left(\mathrm{III}\right) \mathrm{in}\hspace{0.17em}{\mathrm{FeCl}}_3$