Metallic oxides of zinc,magnesium,and copper were heated with the following metals. In which cases will you find displacement reactions taking place?

(D) displacement reaction occurs when a more reactive metal displaces a less reactive metal from its oxide. Based on the reactivity series $(Mg > Zn > Cu)$:

Metal	Zinc $(Zn)$	Magnesium $(Mg)$	Copper $(Cu)$
Zinc oxide $(ZnO)$	No reaction	Displacement	No reaction
Magnesium oxide $(MgO)$	No reaction	No reaction	No reaction
Copper oxide $(CuO)$	Displacement	Displacement	No reaction

Displacement reactions occur when:
$1$. $Mg$ is heated with $ZnO$ $(Mg + ZnO \rightarrow MgO + Zn)$
$2$. $Zn$ is heated with $CuO$ $(Zn + CuO \rightarrow ZnO + Cu)$
$3$. $Mg$ is heated with $CuO$ $(Mg + CuO \rightarrow MgO + Cu)$