Explanation

(c)
All bivalent metal cations form oxide of type MO.
Copper forms two types of oxides $i.e$., ${Cu}_{2}O,\ CuO$
Barium forms $BaO$
Silver forms ${Ag}_{2}O$
Lead forms $PbO,\ {PbO}_{2}$
Hence, silver cannot form MO type of oxide because it forms monovalent cation (${Ag}^{+}$).