Zach Was Stopped Around 11:00 P

Zach was stopped around 11:00 p.m. on Saturday night at a roadblock the police had established on a city street to check for drivers who were under the influence of alcohol. As Officer Williams approached Zach's car she used her flashlight to look into the car and observed what appeared to be a machinegun on the back seat. She ordered Zach out of the car and arrested him. Officer Williams placed Zach in the backseat of her patrol car. She then searched Zach's car and found a bag of counterfeit $20 bills under the driver's seat and a box containing ten stolen iPods in the trunk. Was it legal to stop Zach at the roadblock:

A) Yes, the police are allowed to use roadblocks to protect the public from drivers who are under the influence of alcohol.
B) Yes, the police are allowed to use roadblocks to prevent criminal activity.
C) No, the police must obtain a court order prior to establishing roadblocks.
D) No, the police are only allowed to stop motorists if there are specific articulable facts that the vehicle code is being violated.