Concept:Latitudes (lines running east-west) and longitudes (lines running north-south) form a grid on maps and globes.Solution:The latitude and longitude of a place give its exact position, for example Accra is about 5.6∘ N, 0.2∘ W.So they are used to locate places and objects on maps.Contour lines (A, D) show height and relief; the direction of a stream (C) is shown by the river itself and the slope.Answer:Option B (locate objects on maps)