An experiment is carried out to find the reactivity order of metals X and Y when compared with lead. Separate strips of each metal were placed into different test-tubes containing aqueous lead(II) nitrate, $\text{Pb(NO}_3)_2$. The observations are shown. What is the order of reactivity, with the least reactive first?
- A$\text{Pb} \rightarrow \text{X} \rightarrow \text{Y}$
- B$\text{X} \rightarrow \text{Y} \rightarrow \text{Pb}$
- C$\text{X} \rightarrow \text{Pb} \rightarrow \text{Y}$
- D$\text{Y} \rightarrow \text{Pb} \rightarrow \text{X}$