You See a Person Hastily Throw Something Away in a Trash

You see a person hastily throw something away in a trash can when he or she saw a police officer walking toward him or her.After you tell the police officer this,he reaches in the bag you saw and finds a gun.He then goes up to the person you say throw it away and conducts a search.What does the finding of the gun signify to the court?

A) A reasonableness of the search
B) An illegal search
C) Reasonable expectation of privacy
D) Administrative justification