Question

#47 unions used (a)strikes or (b)sit - ins as a tool to force owners to meet their demands by refusing to work.
#48 (a) carnegie or (b)vanderbilt was a robber baron who made his fortune from steel and buying up other companies that were similar.
#49 (a)robber barons or (b)labor unions were most influential in improving the working conditions during the industrial revolution.

Explanation:

#47

Unions use strikes (workers refusing to work) to pressure owners. Sit - ins are more associated with civil rights protests, not labor - related work refusal. So the correct option is A.

Andrew Carnegie made his fortune in the steel industry and through acquiring similar companies. Vanderbilt was more associated with railroads and shipping. So the correct option is A.

Labor unions fought for better working conditions (like fair wages, safe workplaces) during the Industrial Revolution. Robber barons were industrialists who often exploited workers. So labor unions were more influential in improving working conditions. The correct option is B.

Answer:

A. strikes

#48