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.
Fish eat fish and donkey eat donkey need points
Answer:b. caused real GDP to fall dramatically between 1929 and 1933.
Explanation:The Great Depression started in 1929 became the longest and deepest economic crisis at least in recent economic history which caused real GDP to fall dramatically between 1929 and 1933.