As a map reader, when you encounter choropleth maps or proportional symbols maps in which numerical data have been grouped into categories with specific ranges of data, why do you need to be cautious in your interpretation of the map?

A) If the map has been classified using the quantiles method, extreme values (outliers) are likely to be hidden, making these extremes appear to not differ from other values.
B) If the map has been classified using equal intervals, many locations may be lumped into the same category and look identical on the map, hiding what may be distinct differences among places.
C) If you cannot tell which classification method was used, there is a possibility that the map maker has selected category ranges specifically to make the map appear to depict spatial patterns favored by the map makers when there are really no patterns in the data.
D) All of the above.