Final answer:
The description of Colorado refers to a 'Region' which in geographical terms, is defined by a set of features or phenomena that characterize a specific area, distinct from others.
Step-by-step explanation:
Describing Colorado as an area that contains high desert, mountains, foothills, and plains would be an example of Region (C). A region is an area characterized by a distinctive combination of cultural and physical features such as government, language, situation, or landforms. In geography, regions are basic units of study, where each region is defined by a feature or a set of features that distinguish it from other areas.
The description given does not align with Location (A), as it does not specify a particular point or address. Movement (B) refers to the dynamics within a region, whereas Place (D) focuses on the specific physical and human characteristics of a location. The fact that Colorado contains diverse landforms like high deserts and mountains is indicative of a regional designation, recognizing it as a part of the larger Plains area which constitutes distinct geographic phenomena.