Mail Cars Connected to Pullman Cars During the Pullman Strike

Mail cars connected to Pullman cars during the Pullman strike:

A) allowed the strikers to create as big a disruption as possible
B) stopped President Grover Cleveland from expressing his support for the union
C) justified a federal intervention, ending the strike by allowing railroad executives to claim that it interfered with the mail
D) allowed union leaders throughout the country to exchange correspondence during the strike
E) prevented anarchists from communicating with the strikers