Consider the following problem:"The building manager for a brand new apartment building in the center of the city has been receiving complaints about how slow the elevators are. As the building is still under construction, the problem is the worst at peak hour when the workers use the lifts to bring their tools and materials up to the top floors, however he still gets a lot of complaints at other times. The building manager decides to hire a work crew to come in and try and speed up the elevators, but unfortunately they tell him it isn't possible.The construction won't be finished for another few months, so he needs to figure out how to get the elevators to work faster. It is starting to stress him out and the residents are getting more annoyed.On the day that the construction crew bring in the mirrors for the apartments on level 11, he notices that he receives no complaints. The complaints start up again the next day, but oddly when the mirrors are delivered for level 12 there are no complaints either.The manager suddenly realizes how he can reduce the number of complaints and installs mirrors next to the elevators on each floor. He also installs mirrors in each of the elevators and now only receives only one complaint a month."Adapted from Fogler & LeBlanc, 2011What was the real problem?(a). The residents were bored waiting for the elevators.(b). The residents were annoyed at not having mirrors in their apartments.(c). The elevators were slow.(d). The residents didn't like the workers using their elevators.

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