The correct answer is B) that jobs, where people do something for others, predominate.
The other options of the question were A) that jobs where people work in factories predominate. C) that jobs where people work the land predominate. D) that jobs in government predominate.
The meaning of the statement the "service sector" jobs are predominant in Europe's mixed economies today is "jobs where people do something for others, predominate."
The service sector is an important creator of jobs and is one that produces a lot of money in the European market. In the service sector, people provide a service that is needed for other people in many fields such as tourism, entertainment, sports, culture, and customer service.