A single epicyclic gear train is shown in the given figure. Wheel A is stationary. If the number of teeth on A and B are 120 and 45 respectively, then when B rotates about its own axis at 100 rpm, the speed of C would be
(a) 20 rpm (b) $27\frac{13}{11}$ rpm
(c)19$\frac{7}{11}$
rpm (d) 100 rpm