The correct answer is C. They provide details that create mental pictures for the reader.
Explanation.
Description is a term used to refer to the action and effect of using language to represent in detail the characteristic features of an object, person, place, situation or event. This action aims to create in the reader a mental image of the subject of the which is being treated. An example of a description of a place can be a bathroom in which we generally find objects such as a sink, shower, and toilet; it is a place with different functions such as washing hands, making physiological needs, bathing, among other activities. So, the correct answer is C. They provide details that create mental pictures for the reader.