Chem help Henry's Law?

Molar mass of O₂ = 16.0 × 2 g mol⁻¹ = 32.0 g mol⁻¹

Concentration of dissolved O₂, C = (4.0 × 10⁻³ g L⁻¹) / (32.0 g mol⁻¹) = 1.25 × 10⁻⁴ mol L⁻¹
Henry's law constant, Kₕ = 1.28 × 10⁻⁸ mol L⁻¹ Pa⁻¹
Pressure of O₂, P = ? Pa

Henry's law: C = kₕ P
Minimum partial pressure of O₂., P = C / kₕ = (1.25 × 10⁻⁴) / (1.28 × 10⁻⁸) Pa = 9800 Pa = 9.8 kPa

The answer: (C) 9.8 kPa