Hope it will helps uh.....
This one is D- “Viet, who desperately needed an idea for his paper, had a moment of brilliance at lunchtime.”
Answer:
ethnography
Explanation:
Ethnography -
It refers to as a quantitative and qualitative research method , for studying certain specific group or society .
The method require to have a proper search and information for the subject .
The example are some groups like communities , organization , etc .
Hence , from the given scenario of the question ,
The correct answer is ethnography .
Direct information contains a bias in favor of that particular product or service.