Assertion $(A):- MgSO_{4}$ is readily soluble in water.
Reason $(R):-$ The greater hydration enthalpy of $Mg^{2+}$ ions overcomes its lattice enthalpy.

• A
  $A$ and $R$ both are correct and $R$ is the correct explanation of $A$.
• B
  $A$ and $R$ both are correct but $R$ is not the correct explanation of $A$.
• C
  $A$ is correct but $R$ is not correct.
• D
  $A$ is incorrect but $R$ is correct.