An air stream is flowing over a thin, smooth flat plate that has a dimension of 1.0ft in the direction of the flow. The heat transfer coefficient between the flat plate and the air stream is obtained from the following expression. Nnu= 0.664 (Nre) (Npr). The thermal conductivity of air is 0.0156 Btu/ (hr-ft-F). If the Reynolds number for the flow of air over the Flat plate is 3x 10 and the Prandtl number is 0.9. Then the heat transfer coefficient [Btu/(hr-ft-F)] is

A)0.6 B)5.5 C)8.3 D)9.6