The correct option is C Sectional interest groups
Usually, interest groups seek to promote the interests of a particular section or group of society. Trade unions, business associations and professional (lawyers, doctors, teachers, etc.) bodies are some examples of this type. They are sectional because they represent a section of society: workers, employees, business persons, industrialists, followers of a religion, caste group, etc. Their principal concern is the betterment and well-being of their members, not society in general.