The following equations indicate reactions that occur spontaneously.

$$\begin{array}{*{20}{l}} {{\text{Fe(s)}} + {\text{NiC}}{{\text{l}}_2}{\text{(aq)}} \to {\text{FeC}}{{\text{l}}_2}{\text{(aq)}} + {\text{Ni(s)}}} \\ {{\text{Zn(s)}} + {\text{FeC}}{{\text{l}}_2}{\text{(aq)}} \to {\text{ZnC}}{{\text{l}}_2}{\text{(aq)}} + {\text{Fe(s)}}} \\ {{\text{Ni(s)}} + {\text{PbC}}{{\text{l}}_2}{\text{(aq)}} \to {\text{NiC}}{{\text{l}}_2}{\text{(aq)}} + {\text{Pb(s)}}} \end{array}$$

Which is the increasing order of the reactivity of the metals?

A.     ${\text{Fe}} < {\text{Ni}} < {\text{Zn}} < {\text{Pb}}$

B.     ${\text{Pb}} < {\text{Ni}} < {\text{Fe}} < {\text{Zn}}$

C.     ${\text{Ni}} < {\text{Zn}} < {\text{Pb}} < {\text{Fe}}$

D.     ${\text{Zn}} < {\text{Fe}} < {\text{Ni}} < {\text{Pb}}$

B