The adsorption of CO gas on charcoal at 273 K fit to the Langmuir isotherm, θ = Kp / (1 + Kp) = V / Vm. Its linear plot of p/V vs. p of the CO gas variation introduced the following least square linear equation p/V (kPa/cm³) = 1.2 kPa/cm³ + 0.0100 cm⁻³ p. Based on these results and given the surface area of a CO molecule 818 nm², the adsorption isotherm equilibrium constant (K) and the surface area of 1 g charcoal at 273 K and 1 atm, respectively, should be A) 1.2e2 kPa⁻¹ and 1.1 km² B) 1.2e-2 kPa⁻¹ and 2.2 km² C) 1.2e-2 kPa⁻¹ and 1.1 km² D) 8.3e-3 kPa⁻¹ and 1.1 km² E) 8.3e-3 kPa⁻¹ and 2.2 km²