A) [Ag⁺]²[CrO₄²⁻]
B) [Ag⁺][CrO₄²⁻]
C) moles of solid / liter of water
D) 1 / ([Ag⁺]²[CrO₄²⁻])
Answer: A
Explanation: Write dissolved-ion concentrations multiplied with exponents from the dissolution stoichiometry. The pure solid has constant activity and does not appear in Ksp.