What takes place when zinc metal is added to an aqueous solution containing magnesium nitrate and silver nitrate ?
1. Zn is oxidised 2. `Mg^(2+)` is reduced 3. `Ag^(+)` is reduced 4. No reaction takes place
A. 1 and 2 only
B. 1 and 3 only
C. 1, 2 and 3 only
D. 4 only
