Officers May Conduct a Warrantless Arrest in Which of the Following

Officers may conduct a warrantless arrest in which of the following circumstances?

A) If there are exigent circumstances.
B) If the officer has knowledge that a crime has been committed and reasonable suspicion to believe the crime was committed by a particular suspect.
C) If the offense was committed in the presence of the officer.
D) If the officer has knowledge that a misdemeanor has been committed and probable cause to believe the crime was committed by a particular suspect.