Harold Was Developing a Questionnaire to Conduct an Online Survey

Harold was developing a questionnaire to conduct an online survey regarding the factors that influence textbook selection by professors for a particular course.Since he was unsure of the possible responses for each question, he decided to confer with some professors at a local university to decide on the responses that he could include in the questionnaire.The method of exploratory research that Harold used to decide on the responses was:

A) in-depth interview.
B) panel research.
C) experimental research.
D) observation.
E) projective technique.