When May Government Agents Search Without a Search Warrant

When may government agents search without a search warrant?

A) When law enforcement officials believe it is likely that the items sought will be removed before they can obtain a warrant.
B) Outside of normal working hours for a judge.
C) When they can show that the suspect who lives in the residence at issue has been in jail previously.
D) When they can show that a felony is involved.
E) When they can show that they have heightened probable cause.