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The substance that will increase the solubility of CaCO₃ in water is;
B: HCl
We are considering the equilibrium process;
CaCO₃ ⇌ Ca²⁺ (aq) + CO₃²⁻ (aq)
Looking at the options, the only one that increase the solubility of calcium carbonate(CaCO₃) in water is HCl.
This is because CaCO₃ dissolves in HCl acid to produce CO₂ gas since it will not dissolve in pure water.
Now, the solubility product constant Ksp for calcium carbonate (CaCO₃) in water is 3.4 x 10⁻⁹ mol/dm³ which is very low.
Thus, the chemical reaction that takes place when CaCO₃ is dissolved in HCl acid is;
CaCO₃ (s) + 2HCl(aq) → CaCl₂ (aq) + H₂CO₃(aq)
The missing options are;
a. Na₂CO₃
b. HCl
c. NaHSO₄
Read more about Solubility Product Constant at; https://brainly.com/question/13131044