Extremely Difficult Working Conditions in the Meat Packing Industry

Extremely difficult working conditions in the meat packing industry:

A) Have only occurred since the 1960s.
B) Have improved dramatically now that most of the process is automated.
C) Have been "normal" since the 19th century.
D) Are a much greater problem for female workers than male workers.
E) Have almost disappeared as the result of the unionization of the industry.