Which of the following sets correctly represents the increase in the paramagnetic property of the ions?
- A$Cu^{2+} < V^{2+} < Cr^{2+} < Mn^{2+}$
- B$Cu^{2+} < Cr^{2+} < V^{2+} < Mn^{2+}$
- C$Mn^{2+} < V^{2+} < Cr^{2+} < Cu^{2+}$
- D$Mn^{2+} < Cu^{2+} < Cr^{2+} < V^{2+}$
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Assertion $(A)$: The first ionization enthalpy of $3d$ series elements is more than that of group $2$ metals.
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