The redox reaction that would most likely occur if silver and zinc metal were added to a solution that contained ions is:

$$Zn (s) + 2Ag^+ (aq) \rightarrow Zn^{2+} (aq) + 2Ag (s)$$

In this reaction, zinc metal is oxidized from a neutral state to a +2 oxidation state, while silver ions are reduced from a +1 oxidation state to a neutral state. The oxidizing agent in this reaction is silver ions, while the reducing agent is zinc metal.