A reagent capable of oxidising ethanal to ethanoic acid, or to ethanoate ions, will also oxidise methanoic acid, $\text{HCO}_2\text{H}$, to carbon dioxide and water. On heating, which reagents would react differently with $\text{HCO}_2\text{H}$ and $\text{CH}_3\text{CO}_2\text{H}$?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only