Given the following compounds with their K_sp values, choose the compound that will have the highest molar solubility in pure water.

• A. CuS, K_sp = 6.00×10^–16
• B. CaCO₃, K_sp = 3.36×10^–9
• C. CuCN, K_sp = 3.47×10^–20
• D. SrSO₄, K_sp = 3.44×10^–7
• E. PbS, K_sp = 9.04×10^–29

Answer: (D)