The answer is D, the main focus of a sociological perspective is to study how groups influence people.
The focus of sociology is human behavior and its relationship with society as a whole, in doing so, sociologists have developed different perspectives from which to analyze the social world. Each one of these offers different explanations for social behavior, such as change and permanence. It is the study of social relationships, but more than relationships between people, it is the study of relationships between individuals and social structures.