Answer:
c. reviewing the literature of existing theories
Explanation:
Someone interested in studying the effects of text-messaging rather than talking on the phone on the quality of friendships would perform a review of literature of existing theory as the first step in order to follow the scientific method.
Reviewing literature of existing theory regarding a topic of research interest should be the first step by a researcher for the following reasons;
1. It will give you information about the current trend of research regarding the topic of interest and in some cases, you might find out from literature review that the question of interest to you have been successfully answered by a previous research.
2. It will give the researcher idea on the research methodology to adopt in the study.