Answer:
d. ethnographic research
Explanation:
Ethnographic research -
It is a type of research method , where the people tries to interact with the people in real life , in order to get the best and most pure information regarding the research topic , is referred to as ethnographic research .
The method is very effective and efficient to attain knowledge for the research topic .
Hence , from the given scenario of the question ,
The correct option is d. ethnographic research .