Evaluations for input

In contrast to the liquid rocket in Fig. P3.34, the solid-propellant rocket in Fig. P3.35 is self-contained and has no entrance ducts. Using a control-volume analysis for the conditions shown in Fig. P3.35, compute the rate of mass loss of the propellant, assuming that the exit gas has a molecular weight of 28. <image 1>

(A) -10.0 kg/s

(B) -11.8 kg/s

(C) -12.4 kg/s

Answer with the option's letter from the given choices directly. No punctuation.