The first important labor union in the United States was called the Knights of Labor. The correct option among all the options given in the question is option "c". This labor union was formed during the late 1880's. Although this union did not survive for a long time due to lack of leadership, still it was a force to reckon with when it first started.
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Answer:
Case study.
Explanation:
A case study is simply research method that entails of a detailed account that contains useful information of a sad person or group in an organisation or a place. In a making a swift or correct case study, some steps and correct facts are needed to be known without mincing words which include, having a set number of people, knowing the person that is been researched on totally, tangible evidences etc. A formal research method is been carried out in the cause of a case study which are seen easily in formal research venues, as professional conferences, and journals rather than in popular works.
The answer to the question is B
