D And F Block Elements

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : \(\mathrm{Cu^{2+}}\) in water is more stable than \(\mathrm{Cu^{+}}\).

Reason (R) : Enthalpy of hydration for \(\mathrm{Cu^{2+}}\) is much less than that of \(\mathrm{Cu^{+}}\).

In the light of the above statements, choose the correct answer from the options given below :