Which of the Following Searches Does Not Violate the Fourth

Which of the following searches does not violate the Fourth Amendment?

A) A search is taking place at a roadblock where an accident had occurred, and the police are looking for a specific suspect or information that could help them find him.
B) Infrared cameras are being used to find greenhouses growing marijuana.
C) A GPS device is attached to a suspect's car to see where he goes.
D) A search for drugs is conducted on every car at a roadblock on a route where police believe there is heavy drug traffic.
E) A warrantless search of a residence is conducted where the resident is not a terror suspect.