Four metals — zinc, M, copper and magnesium — are each reacted with aqueous solutions of their nitrates. The outcomes are displayed. In which sequence do these four metals rank by reactivity, 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