Question

which is a reason for the rapid growth of labor unions in the late 1800s?
the low wages paid to factory workers
a lack of jobs for unskilled workers in the nations cities
a lack of workers to fill all the factory jobs
the failure of negotiations between unions and employers

Explanation:

Labor unions grow when workers seek better conditions. In the late 1800s, factory workers faced low wages, so they joined unions to advocate for higher pay. A lack of jobs (second option) would not drive union growth as workers would compete for jobs. A lack of workers (third option) would give employers power, not workers. Failed negotiations (fifth option) happen after unions exist, not cause growth. So low wages (first option) is the reason.

Answer:

A. the low wages paid to factory workers