Sociologists who use the framework focus on how societal institutions, such as our governmental system and health-care system, are necessary and essential to society.

STRUCTURAL- FUNCTIONALISM

Explanation:

Sociologist who use STRUCTURAL FUNCTIONALISM framework emphasizes on the importance of social institutions such as the family, religion, and education for producing a stable society because government system, education and health care are important aspect of a stable society.

For example Education has several important functions in a society, such as socialization, learning. One of the key ideas in Structural Functionalism is that society is made-up of groups or institutions, which are cohesive and share common norms.

Sociologist also use Structural Functionalism to emphasizing on the relationships between the various social institutions that make up society e.g., government, law, education, religion and while they are important in the society.

i would say b. research typically uses a variety of sources