The research method that uses information that has been already collected and made available for the public by governments, businesses and educational institutions are called secondary analysis. Secondary analysis or secondary data analysis take advantage of data that is already available and apply it to new research.
The correct answer is D. secondary analysis.
13 - 5 = 8 (eight classical music discs were bought.)
I believe it is B because for a monopoly it has no close substitute and is protected by a barrier that prevents other firms from selling that good or service
