The Molar Absorption Coefficient of Potassium Permanganate, KMnO₄, Is 200

The molar absorption coefficient of potassium permanganate, KMnO₄, is 200 m² mol^-1 at a wavelength of 200 nm. Determine the concentration of a solution that would absorb 75% of the intensity of radiation of this wavelength for a path length of 1.0 cm.

A) 120 mol dm^-3
B) 0.69 × 10^-3 mol dm^-3
C) 0.30 × 10^-3 mol dm^-3
D) 6.2 × 10^-5 mol dm^-3