The case study method is an empirical investigation that uses (A) Multiple data sources (B) Individual data terminals (C) Traditional data sources (D) A single non-reliable source Correct Ans: (A) Explanation: Researchers use the case study method to conduct an empirical investigation by gathering information from multiple data sources. Since this method focuses on a detailed examination of a single case, it relies on various forms of evidence to ensure accuracy and depth. For example, when researchers analyze media influence on public opinion, they collect data from interviews, news reports, surveys, historical records, and audience analytics. By integrating these diverse sources, they build a comprehensive understanding of the topic. Because case studies often explore real-life situations, they provide rich insights into complex communication phenomena. Now, let’s analyze the incorrect options. Individual data terminals refer to standalone sources, which limit the scope of research. Traditional data sources, while useful, do not define case study methodology since researchers incorporate both conventional and modern sources. A single non-reliable source weakens the credibility of findings, making it unsuitable for empirical research. Clearly, none of these options fit the nature of the case study method. In conclusion, researchers depend on multiple data sources in case study research to ensure accuracy and depth. Since this method provides a holistic perspective, it remains a valuable tool in communication studies. By combining different types of evidence, researchers strengthen their arguments and produce more reliable conclusions.