Final answer:
The city manager system reduces political party influence by hiring experienced professionals to run the city's operations. It has been adopted by over 3700 cities. option a.
Step-by-step explanation:
In this case, the type of government system that reduces the influence of political parties and ensures that the city is run by an experienced professional is the city manager system.
The city manager system is designed to avoid corruption by political machines. In this system, citizens elect city councilors who handle legislative issues, but their primary job is to hire a city manager to oversee the daily management of the city. The city manager is typically an engineer or businessman with expertise in city operations.
Over 3700 cities, including major cities like Austin, Dallas, and Phoenix, have adopted the city manager system to promote efficient and professional governance.