Final answer:
The primary purpose of a patrol is to establish a presence and deter potential offenders, creating a safe and secure environment.
Step-by-step explanation:
The purpose of a patrol is B. To establish a presence and to deter potential offenders. Patrolling serves as a way to create a visible security presence, deterring potential criminal activity by signaling that the area is being monitored. Security guards perform patrols not only to prevent crime but to also respond promptly to emergencies, offer assistance, and ensure that the environment is safe and secure for all.