Which sentence most effectively combines the meanings of these lines? the hero slew the dragon. then he returned to the city. at that time, a princess gave him a garland. he had rescued the princess before he slew the dragon. the hero who slew the dragon returned to the city where he had rescued the princess who gave him a garland. the princess gave a garland to the hero who had rescued her, who slew the dragon, and who returned to the city. when the hero returned to the city after slaying the dragon, the princess whom he had rescued gave him a garland. the princess whom the hero had rescued, slaying the dragon and returning to the city, gave him a garland.