Kₛₚ of salt AB, AB₂, and A₃B are 4.0 × 10⁻⁸, 3.2x10⁻¹⁴, and 2.7 × 10⁻¹⁵ respectively at temperature t. The solubility order of these salts in water at temperature t (in mol litre⁻¹) will be:
a. A₃B < AB₃ < AB₂
b. AB < AB₂ < A₃B
c. A₃B < AB₂ < AB
d. AB₂ < AB < A₃B
