Which best describes why “ambush” contains a frame story? the narrator situates a flashback of his experience in vietnam between related events that take place after the war. the narrator describes events that take place in two different countries: the united states and vietnam. the narrator situates a flashback to his boyhood between related events that take place in the present, when he is an old man. the narrator describes events that take place in two different locations: a living room and a jungle.