Final answer:
During the colonial era, the "Watch System" of policing was composed of volunteers and constables, making it an ineffective crime control device.
Step-by-step explanation:
The "Watch System" of policing during the colonial era was composed of A) Military personnel; effective in crime control, B) Volunteers and constables; an ineffective crime control device, C) Local magistrates; unknown effectiveness in crime control, D) Politicians and landowners; effective in crime prevention.
The correct answer is B) Volunteers and constables; an ineffective crime control device. During the colonial era, the "Watch System" relied on volunteers and constables to patrol the streets and maintain order. However, this system proved to be ineffective in controlling crime. The volunteers and constables lacked professional training and were not able to effectively prevent and solve crimes.