A person standing in a room loses heat to the air in the room by convection and to the surrounding surfaces by radiation. Both the air in the room and the surrounding surfaces are at 20°C. The exposed surface of the person is 1.5 m² and has an average temperature of 32°C, and an emissivity of 0.90. If the rates of heat transfer from the person by convection and by radiation are equal, the combined heat transfer coefficient is
(a) 0.008 W/m²·K

(b) 3.0 W/m²·K

(c) 5.5 W/m²·K

(d) 8.3 W/m²·K

(e) 10.9 W/m²·K