Based on common solubility rules, which compound is most likely to be soluble in water?

• A. $C_{\mathrm{a}}{C}_{\mathrm{O}}{3}_{\mathrm{}}$
• B. $K_2{S}_4$
• C. $N_2{O}_3$
• D. $B_{\mathrm{a}}{S}_{\mathrm{O}}{4}_{\mathrm{}}$

Answer: (B)