Answer:
Focus Group Interview
Explanation:
The reason is that the focus group is a small number of people who have great influence over the behavior of the consumer because of their knowledge and informed decision making. This is also because they know what changes in the environment are prominent these days and what product price is best choice for the features that the customer is willing to purchase. So the group of people (who largely interact with the customers) who has influence over the decision making of the customer to buy a particular product is Focus Group Interview.