How Did Unions Often Fare in Organizing Labor Around the Years

How did unions often fare in organizing labor around the years 1860-1900?

A) Conditions were so terrible in the various work environments that unions experienced no trouble with recruiting members, growing unimpeded.
B) A defining principle of unions was that they refused to engage in violence of any sort, so they had a difficult time getting through to executives.
C) Immigrants from many different ethnic groups were far more likely to join unions than white Americans.
D) Unions faced significant obstacles, such as the so-called blacklisting of union organizers to keep them from getting hired.
E) Only middle-class Americans had the means to join unions, which resulted in the exclusion of the working poor.