GKFix MCQ Question

What is the [H⁺] in tomato juice with pH 4.2?

• A. 6.31 × 10⁻⁵ M
• B. 4.2 × 10⁻⁵ M
• C. 1.0 × 10⁻⁴ M
• D. 5.0 × 10⁻⁵ M