Answer: Ethnographic research
Explanation:
The ethnographic research is one of the type of quantitative technique that helps in understanding the research interacting process with the real environment.
The main purpose of this type of research is that it helps in interpreting the given data for evaluating its implications and also illustrating the social culture on the basis of the observations.
According to the given question, the ethnographic research is one of the special observational method that discovered the behavior and reaction of the customers.
Therefore, Ethnographic research is the correct answer.
