10 kip/ft 50 kip : ft 63 B 5 ft 5 ft The simply-supported beam above is subjected to a uniformly distributed load and couple moment, as shown. The beam is supported by a pin at A and roller at B. Which of the following is closest to the magnitude of the reaction at B? a) 12.5 kip b) 32.5 kip c) 7.5 kip d) 17.5 kip