Which of the following most logically completes the argument?
Last year a higher percentage of workers received salary bonuses in the south of Breeland than in the north. Moreover, of those workers who did receive a bonus, a higher percentage in the south than in the north saved part of it. Clearly, therefore, a greater number of workers in the south of Breeland than in the north saved part of the bonuses they received last year, since __________.
(A) the per capita income in the north is lower than in the south
(B) bonuses received by workers in the south were smaller, on average, than bonuses received by workers in the north
(C) the unemployment rate is no higher in the north than in the south
(D) there are about the same number of workers in the south as in the north
(E) workers in the south are older, on average, than workers in the north