20. Which factor restricted the growth of labor unions during the late 1800's?

a. Most employees were very hostile towards workers' efforts to organize.

b. The Federal Government declared that unions were illegal.

c. Most factory workers were satisfied with their wages and working conditions.

a. Most employees were very hostile towards workers' efforts to organize.

Explanation:

The answer can be traced to Knights of labor formed in late 1800's to serve the cause of Labor skilled and unskiller workers.

It tried to act as a labor union, dealing with employers on behalf of workers, but it was not well organized and well funded.

Hence option A seems to be well aligned with it and is correct answer.

sumerians were responsible.