Final answer:
The step of market research where telephone interviews are used is data collection, which involves gathering information through various methods like surveys and interviews.
Step-by-step explanation:
The step of market research described where telephone interviews can be used is data collection. This is the process of gathering facts and research on a topic through various methods, including surveys, interviews, and questionnaires. Conducting telephone interviews is a method of field research that enables researchers to collect raw data by engaging in questions and answers with people who have knowledge to share regarding the research topic. Technology like computer-assisted telephone interviewing (CATI) has made the process more efficient, by randomly calling telephone numbers and connecting interviewers with respondents to gather information directly.