Final answer:
A collection of more than two people in interdependent communication and collaboration defines a group. For the question's context, a Focus Group (c) is the closest term if it refers to a diverse group of people engaged in a structured discussion.
Step-by-step explanation:
A collection of more than two people who share some kind of relationship with one another, who communicate in an interdependent fashion, and who collaborate toward some shared purpose defines a group.
Option (c) Focus Group falls closest to this definition, provided it is referring to a small, diverse group of people whose reactions are studied about a particular topic in guided or open discussions. The term 'group' generally refers to any collection of at least two people who interact with some frequency and who share a sense that their identity is somehow aligned with the group. These interactions can be a significant part of how we think about society and human interaction, involving everything from work to social activities. Groups have many functions and can form the basis of our social lives.