Because of tension between the police department and the citizens of metropolis, the city council surveys residents for suggestions on how to improve police-community relations. this example best illustrates as a source of research ideas.

practical problems

Explanation:

The 'practical problem' is to make what is not by nature become, because it should be. That is, what is not in reality has become, because of a mental attitude in which a modification of the area is projected. In the case shown in the question above, there was no agreement between the police department and the citizens of the city, so a survey was created where citizens could give suggestions on how to improve this relationship, that is, through the survey was created a way to establish agreement between citizens and police departments, because that was convenient. This example best illustrates practical problems as a source of research ideas.

i think it's b or c hope this