Rural sociology is a subfield of sociology that focuses on understanding the social, economic, and cultural dynamics of rural communities. It examines aspects such as rural social structures, family systems, economic activities (e.g., agriculture), cultural practices, and the impact of modernization or policy changes on rural life. Options (1), (2), and (4) are incorrect because they pertain to urban contexts, which are outside the scope of rural sociology. Thus, option (3) is correct, as it accurately describes the primary focus of rural sociology.