Among the following, the compound that is readily soluble in water is

Solubility order:

$\stackrel{{\mathrm{BeSO}}_4>{\mathrm{MgSO}}_4>{\mathrm{CaSO}}_4>{\mathrm{SrSO}}_4>{\mathrm{BaSO}}_4}{⟶}$
As hydration energy decreases solubility decreases
If anion size is large   $\left[{\mathrm{SO}}_4^{-2},{\mathrm{CO}}_3^{-2}\right]$ then with small change in cation size there is no coniderable change in lattice energy then the solubility depends on the hydration energy i.e., here hydration energy dominating factor over lattice energy
With increase in size of cation hydration energy decreases and hence solubility decrerases.
Hydration energy $\propto$ solubility
BeSO₄ readily soluble in water
Where as as BaSO₄ is least soluble in water