The relative reactivity, or activity, of different metals can be determined by studying their single-replacement reactions with other metal compounds. Rank the following metals, copper, zinc and silver, from most active to least active based on the reactions summarized below. Explain your reasoning.

Zn(s) + CuCl2(aq) → Cu(s) + ZnCl2(aq)
Cu(s) + ZnCl2(aq) → NR
Cu(s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)