The standard heat of formation, in $\text{kcal/mol}$ of ${\text{Ba}}^{2+}$ is :[Given : standard heat of formation of ${\text{SO}}_4^{2-}(\text{aq})=-216\text{kcal/mol}$, standard heat of crystallisation of ${\text{BaSO}}_4(\text{s})=-4.5\text{kcal/mol}$, standard heat of formation of ${\text{BaSO}}_4(\text{s})=-349\text{kcal/mol}$ ]

1. A
   $-128.5$
2. B
   $-133.0$
3. C
   $+133.0$
4. D
   $+220.5$