Some ionic compounds like $\mathrm{AgBr}, {\mathrm{BaSO}}_4$ and ${\mathrm{CaCO}}_3$ do not dissolve in water because

The $\%$ ionic character of the binary compound $\mathrm{A}-\mathrm{B}$ is given by $\%$ ionic character $=16\left({\mathrm{X}}_{\mathrm{A}}-{\mathrm{X}}_{\mathrm{B}}\right)+3.5{\left({\mathrm{X}}_{\mathrm{A}}-{\mathrm{X}}_{\mathrm{B}}\right)}^2$

Which of the following compound is more than $50\%$ ionic?