Concept:Land has a fixed supply, so its quantity cannot be changed.
Explanation:Land as a factor of production does not vary in quantity because the total land area on Earth is fixed.
No one can increase or decrease the total amount of land available.
However, other features of land can differ from one place to another.
The nature of land refers to its physical characteristics like relief, soil type, and climate.
The quality of land refers to its productivity or usefulness for farming, building, or other purposes.
The cost of land depends on its location, demand, and potential use, so it also varies.
Therefore, while land can change in nature, quality, and cost, its overall quantity remains constant.
Answer:The correct option is C: quantity.