Answer
Please see the work below.
Work Step by Step
We know that
a. $Cu_{(s)}+HCl_{(aq)}\rightarrow$no reaction because copper is less reactive than Hydrogen.
b. ${I_2}_{(s)}+NaBr_{aq} \rightarrow$ no reaction because Iodine is less reactive than $Br_2.$
c. $Mg_(s)+{CuSO_4}_{(aq)}\rightarrow {MgSO_4}_{(aq)}+Cu_{(s)}$
d. ${Cl_2}_{(g)}+2KBr_{(aq)}\rightarrow 2KCl_{(aq)}$
