Answer:
BaSO₄. Option C is correct
Explanations
The substances that dissolve readily in water are ionic compounds and polar covalent compounds. Examples of ionic compounds that dissolve in water are salts, oxides, hydroxides, sulfides, and the majority of inorganic compounds.
The molecules in a polar solvent have a dipole, like water, one side is more negative and one is more positive.
Ionic compounds are composed of a positive ion, normally a metal, and a negative ion, normally a nonmetal, so their forces are attracted to their charge difference.
Thus, a polar solvent dissolves each ion with its corresponding parts, dissociating the two ions of the ionic compound.
Since sulfides are ionic compounds hence the substance that will dissolve most readily in water is BaSO₄. The molecule is formed by one barium cation Ba2+ and one sulfide anion S2-. The two ions are bound through an ionic bond.