When the detailed opinions of a few industry experts or experienced consumers are needed, __________ is(are) often the best qualitative research method.

When the detailed opinions of a few industry experts or experienced consumers are needed, __________ is(are) often the best qualitative research method. 



A. observation

B. surveys

C. social media studies

D. in-depth interviews

E. secondary data mining studies


Answer: D. in-depth interviews


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