Answer:
A
along the banks of the Amazon river
The best type of map for displaying or representing population density would be choropleth maps. These maps are excellent for displaying numerical values on a map. They display data in shades of a single color with the lighter colors representing smaller values and the more intense colors representing higher numerical values.
Based of the map, you can infer that it's D because if you look the rivers are running through multiple countries and act as a border for the countries of Germany, Austria, Hungary, etc.
hopefully this helps
