Which new actor emerged in European politics through the growth of socialist parties and unions?

Correct answer: Organized working class

The direct answer is A: an organised working class emerged as a new political actor. Industrial workers did not remain only individuals inside factories. Through trade unions they organised around wages, hours, safety and dignity; through socialist parties they entered elections, public debate and legislative politics. Collective organisation gave workers a public voice and allowed them to influence governments and employers. Option A is correct because it names the group created politically by unions and socialist parties. Option B is wrong because absolute kings were older ruling authorities, not a new actor produced by worker organisation. Option C is wrong because feudal warriors belonged to an older agrarian order and were not created by industrial unions. Option D is wrong because a court painter had no connection with mass labour politics. The important chain is: industrialisation created common worker problems, unions organised workers, and socialist parties represented them politically. Exam cue: unions give workers economic bargaining power; socialist parties give them a political platform.