Which of the Following Is Least Likely to Be an Example

Which of the following is least likely to be an example of a police officer acting under "color of law?"

A) An off-duty officer in street clothes flashes his badge while stopping an individual while working as a bouncer at a nightclub.
B) An off-duty officer in street clothes shoots an individual in a bar fight with a nonpolice-issue weapon.
C) An off-duty officer, while wearing his uniform, stops an individual while working as a private security guard.
D) An off-duty officer in street clothes apprehends an individual after identifying himself as an officer and telling the individual to stop.