What is the increasing order of stability of the $+2$ oxidation state for the given group $14$ elements?
- A$Ca^{2+} < Ba^{2+} < Sr^{2+}$
- B$Pb^{2+} < Ge^{2+} < Sn^{2+}$
- C$Ge^{2+} < Sn^{2+} < Pb^{2+}$
- D$Cu^{2+} < Au^{2+} < Ag^{2+}$
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