Alice was held up at the point of a gun, an unusual revolver with a red-painted barrel, while she was clerking in a neighborhood grocery store. Dennis is charged with armed robbery of Alice. The prosecutor calls Winthrop to testify that, a week after the robbery of Alice, he was robbed by Dennis with a pistol that had red paint on the barrel. Winthrop's testimony is 
admissible as establishing an identifying circumstance. admissible as showing that Dennis was willing to commit robbery. inadmissible, because it is improper character evidence.  inadmissible, because its probative value is substantially outweighed by the danger of unfair prejudic