The shoe factory in Centerville is the town' s largest firm, and it employs more unskilled workers on a full-time basis than all of the other businesses in town combined. Ttherefore, if the shoe factory closes down and ceases all operations, more than half of Centerville' s residents who are unskilled workers with full-time jobs in Centerville will lose their jobs. The conclusion above logically follows from the premises if which one of the following is assumed? ['More people who now are residents of Centerville are employed than are unemployed.', 'The shoe factory in Centerville employs no one who is not a resident of Centerville.', 'Centerville has more unskilled workers among its population than it has skilled workers.', 'There are no factories in Centerville other than the shoe factory.']