Final answer:
Effective community policing depends on law enforcement partnerships, building ties and trust with communities through community-oriented policing, and optimization of positive contact with the community.
Step-by-step explanation:
Effective community policing depends on law enforcement partnerships (B).
Building ties and trust with communities through community-oriented policing can increase police legitimacy and reduce crime.
Optimization of positive contact with the community is also essential for effective community policing.