Evaluate the hydronium ion concentration for Yoghurt using the given pH. 
4.3

• A. [H₃O⁺] = 5.0 × 10^-5 mol/L
• B. [H₃O⁺] = 5.0 × 10^-4 mol/L
• C. [H₃O⁺] = 4.0 × 10^-5 mol/L
• D. [H₃O⁺] = 4.0 × 10^-4 mol/L

Answer: (A)