Four metals, P, Q, R and S, are each reacted separately with dilute hydrochloric acid. The table gives the observation for each metal. What is the reactivity order of these four metals, from the most reactive to the least reactive?
- A$R \rightarrow S \rightarrow Q \rightarrow P$
- B$P \rightarrow S \rightarrow Q \rightarrow R$
- C$P \rightarrow Q \rightarrow S \rightarrow R$
- D$Q \rightarrow R \rightarrow P \rightarrow S$