In Connection with Laborers,the Law of Conspiracy Meant That

In connection with laborers,the law of conspiracy meant that

A) employers had every right to organize or conspire to keep wages low and prices high.
B) workers had every right to organize or conspire to keep wages high and working ?hours short.
C) workers could organize unions to promote their own interests as long as they did it publicly ?and in fair dealings with employers and did not "conspire" to do it in secret meetings not ?open to the public.
D) worker organizations aimed at promoting the economic interests of the members ?were illegal.