Solid Potassium Chromate (K₂CrO₄)is Slowly Added to a Solution Containing

Solid potassium chromate (K₂CrO₄) is slowly added to a solution containing 0.50 mol L^-1 AgNO₃(aq) and 0.50 mol L^-1 Ba(NO₃) ₂(aq) .What is the Ag⁺(aq) concentration when BaCrO₄(s) just starts to precipitate?
The K_sp for Ag₂CrO₄(s) and BaCrO₄(s) are 1.1 × 10^-12 and Respectively.

A) 6.5 × 10^-5 mol L^-1
B) 1.3 × 10^-4 mol L^-1
C) 3.2 × 10^-4 mol L^-1
D) 6.8 × 10^-2 mol L^-1