Q. Sandy lives on the top floor of a 10-story building in a big city. There is a 30-story apartment building under construction next door to her building. One morning while eating her corn flakes, a brand new toilet comes crashing through the roof of Sandy’s apartment and injures her. She would like to sue the construction organization, but has no way of find outing out or proving illustrate what persons were involved or exactly illustrate what happened. How the doctrine would most help Sandy?