After locating a source related to a research assignment, a student should first and foremost evaluate the credibility and relevance of the source. However, in the context provided where options are given, the best immediate next step would generally be to use synonyms for your search terms. This can help refine or expand the search to discover additional relevant sources or perspectives.
Using the other options, such as the OR Boolean operator, Wikipedia, or a different database, may also be helpful in specific situations, but using synonyms can be a strategic way to enhance research efficiency and depth.