Final answer:
The choice of blue for the northern aspect in mapping is a widely accepted convention that helps users easily identify and interpret direction on a map. the correct option is (b).
Step-by-step explanation:
In traditional cartography and map design, the convention is to use the color blue to indicate northern aspects. This is based on the association of blue with cold and the fact that, in many cultures, the north is considered to be associated with colder climates. Therefore, when an aspect map is automatically colored and labeled according to compass direction, blue is used to represent the northern direction.
The choice of blue for the northern aspect in mapping is a widely accepted convention that helps users easily identify and interpret direction on a map. It simplifies navigation and enhances map readability by providing a consistent visual cue for orientation.