A surface at 300°C has an emissivity of 0.7 in the wavelength range of 0–4.4 mm and 0.3 over the rest of the wavelength range. At a temperature of 300°C, 19 percent of the blackbody emissive power is in wavelength range up to 4.4 mm. The total emissivity of this surface is
(a) 0.300

(b) 0.376

(c) 0.624

(d) 0.70

(e) 0.50