Concept:A sketch map is a rough, freehand map drawn from memory or observation to show the main features of an area. It is not drawn to scale.Solution:A sketch map has a title, a key and landmarks (important features such as a school, church or river) to guide the reader.Because it is not drawn to accurate measurements, it has no scale.Key point: Scale belongs to accurately drawn maps such as topographical maps.Answer:Option C (Scale)