The Psychologist evaluated the girl so that means that she did a case study of the girl. Then she sent out questionnaires so that means she did a survey and then she came up with a hypothesis and designed a study to see if a diet could be the cause, so that means she did an experiment.
Question: Which of the following lists, in order from first to last, the research methods this psychologist used?
Answer: b) case study, survey, experiment