Concept:Land is a fixed asset because its total physical area cannot be changed by human effort.Explanation:Land is a natural resource with a fixed supply in agriculture.Its total size remains constant over time, even though its quality or use may change.Soil nutrients, vegetation, and micro-organisms can be altered or replaced, but the actual area of land does not increase or decrease.This fixed size is what makes land a fixed asset.Answer:C. its size remains fixed over time