When can government agents obtain a search warrant?

A) When they can establish reasonable cause.
B) When they can establish probable cause.
C) When they can establish cause to a substantial certainty.
D) Anytime they have an informant.
E) Anytime the judge is in his office and they show identification as government agents.

Probable cause is the legal standard by which a police officer or other agent of the government has the grounds to obtain a warrant for an arrest, conduct a personal or property search, or make a similar action regarding a crime. It means there must be a reasonable basis for believing that a crime may have been committed or that evidence of the crime is present in the place to be searched.