A Skydiver of Mass 90

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed,8.35 m/s.The area of his parachute is 40.0 m² and the density of air is 1.15 kg/m³.The drag coefficient is

A) 0.490.
B) 0.521.
C) 0.533.
D) 0.551.
E) 0.560.