Which of the following types of marketing research firms wouldbest be described

Which of the following types of marketing research firms wouldbest be described as one that gathers consumer and tradeinformation which they sell for a fee (e.g. Nielsen MediaResearch)? A. Non-profit marketing researchfirms B. General-line marketing researchfirms C. Syndicated-service researchfirms D. Specialty-line marketing researchfirms E. Custom marketing researchfirms