You Are in a Strange Neighborhood, and a Police Officer

You are in a strange neighborhood, and a police officer drives by. He can clearly see that you do not know the neighborhood and are not from there. He stops you and frisks you because he just had a report of someone who looked like you with a knife. What level of justification did the officer use?

A) probable cause
B) search and seizure
C) reasonable suspicion
D) administrative justification