Concept:Dot maps use dots to show the distribution and density of items across a region.Explanation:A dot map is the best technique when displaying large volumes of data over a wide area, such as cattle numbers across several states.Each dot represents a certain quantity of cattle, which clearly reveals areas of high and low concentration.Isopleths, pie graphs, and proportion circles do not effectively show the exact spatial spread of animals across different locations.Answer:A. Dot map