Consider the oxides of group 14 elements SiO2, GeO2, SnO2, PbO2, CO and GeO. The amphoteric oxides are

Strategy: Identify the amphoteric oxides from Group 14: SiO₂, GeO₂, SnO₂, PbO₂, CO, GeO.

Step 1: Classifying Oxides

• CO: Neutral oxide (does not react with acid or base under normal conditions).
• SiO₂: Acidic oxide (reacts with bases: $\ce{SiO2 + 2NaOH -> Na2SiO3 + H2O}$, but not with acids easily).
• GeO₂: Acidic oxide (similar to SiO₂; weakly amphoteric but predominantly acidic).
• GeO: Basic/weakly amphoteric.
• SnO₂: Amphoteric — reacts with both acid ($\ce{SnO2 + 4HCl -> SnCl4 + 2H2O}$) and base ($\ce{SnO2 + 2NaOH -> Na2SnO3 + H2O}$). ✅
• PbO₂: Amphoteric — reacts with conc. HCl and with NaOH solution. ✅

Step 2: Amphoteric Pair $\ce{SnO2}$ and $\ce{PbO2}$ are both amphoteric.

$\boxed{\text{Answer: (C) }\ce{SnO2,\ PbO2}}$