Answer:
A. map
Step-by-step explanation:
A map is a visual and diagrammatic representation of a place or area. It represents the place on a flat surface. It proves to be an aid to specify and gives detail about any particular place. In the above case, the presenter can use a map to make his audience know about the location of the Civil war battle. The other three options, outline, diagram and graph are also used in a presentation but to specify a place, a map is to be used.