Consider the oxides of group $14$ elements $SiO_2$,$GeO_2$,$SnO_2$,$PbO_2$,$CO$ and $GeO$. The amphoteric oxides are

• A
  $GeO, GeO_2$
• B
  $SiO_2, GeO_2$
• C
  $SnO_2, PbO_2$
• D
  $SnO_2, CO$