The factors that affect the speed of reaction between aqueous sodium thiosulfate and hydrochloric acid can be studied. The ionic equation for the reaction is shown. $\text{S}_2\text{O}_3^{2-}(aq) + 2\text{H}^+(aq) \rightarrow \text{H}_2\text{O}(l) + \text{S}(s) + \text{SO}_2(aq)$ Which of the following methods can be used to investigate the rate of this reaction?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct