Carlos has been asked to participate in a study on the quality of food in the dorm cafeteria. He will be in the study with 20 other students and they will all be able to offer their opinions on the food. This is an example of a group.

focus group

Explanation:

Focus group -

It refers to the combination of various people , whose feedback and reactions are studied for the purpose of any research work , is referred to as a focus group .

The focus group is used in order to collect any data via experiments , interactions etc.

A pure and fresh feedback or review are provided by the focus group , as it is further used for the research purpose .

Hence , from the given scenario of the question ,

The correct answer is focus group .