A specialized observational approach, in which trained observers seek to discover subtle behavioral and emotional reactions as consumers encounter products in their natural use environment, is referred to as research.

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.

1. seasonal

2. frictional unenployment

3. the number of the labor force multiplied by 100 and then subtract the number of unemployed.

4. 4%

5. an increase in prices

i truly dont know the answer wait i do its 1,3,4