The correct options are
C NH4Cl+NaOH⟶NaCl+NH3+H2O
D 4KCN+Fe(CN)2⟶K4[Fe(CN)6]
The reactions are as follows:
2Rb+2H2O⟶2RbOH+H2
0 +1 +2 0
2CuI2⟶2CuI+I2
+2 +1 0
NH4Cl+NaOH⟶NaCl+NH3+H2O
4KCN+Fe(CN)2⟶K4[Fe(CN)6]
As we can see that in (C) and (D), the oxidation numbers of the various elements do not change.
Therefore, they are not redox reactions.