Salt A (MX) and Salt B (MY) are both 1 : 1 ionic compounds. Salt A has a smaller solubility-product constant (Ksp) than Salt B. Each salt is separately added to a 0.050 M solution that already contains its corresponding anion (X⁻ for Salt A, Y⁻ for Salt B). Which of the following compares the percent decrease in molar solubility caused by the common ion?
a) Salt B experiences a greater percent decrease because its Ksp is larger.
b) Both salts experience the same percent decrease because the common-ion concentration is the same.
c) Salt A experiences a greater percent decrease because its solubility in pure water is lower.
d) Neither salt experiences a significant percent decrease because the added anion concentration (0.050 M) is small compared with 1 M solutions.