Four metals, zinc, M, copper and magnesium, are placed into aqueous solutions of their nitrates. The outcomes are displayed. What is the reactivity order of these four metals, beginning with the most reactive?
- Acopper $\rightarrow$ zinc $\rightarrow$ M $\rightarrow$ magnesium
- Bcopper $\rightarrow$ M $\rightarrow$ zinc $\rightarrow$ magnesium
- Cmagnesium $\rightarrow$ M $\rightarrow$ zinc $\rightarrow$ copper
- Dmagnesium $\rightarrow$ zinc $\rightarrow$ M $\rightarrow$ copper