A mountain stream flows over a rocky streambed. Apply the Limerinos and Chezy equations to calculate the discharge. The stream has an intermediate rock size d 84 of 30 cm, an average depth of 2.1 m, a slope of S = 0.0037, and a width of 52 m. Choose the closest answer (m³/s): 

(a) 85, 

(b) 120, 

(c) 160,  

(d) 240, or 

(e) 410.