Historical documents about American police departments in the eighteenth and nineteenth centuries showed police departments had . a. solved the problem of crime in most communities
b. been given the responsibility for addressing population decreases
c. solved the problem of corruption and brutality by officers
d. a chronic problem of locating and hiring qualified personnel

d. a chronic problem of locating and hiring qualified personnel

Explanation:

During the 18th and 19th century, the American police departments were having a problem of locating qualified personnel who would work in the police force.

This led to them to develop a system called Kin police (voluntary men, who watch out for their kins). And, also, people who were part of this group of volunteer performs other task like lighting street lamps, recovering lost children,  capturing runaway animals, and a variety of other services with their involvement in crime control activities being minimal.

no one should discriminated against because he or she is not from a minority group

well this isn't a question but if you are asking if it is true or false it is, true.