What term includes land plus improvements?

The term that includes land plus improvements is "real estate." This term encompasses not just the physical land itself, but also any structures or enhancements made to that land, such as buildings, roads, and utilities. In real estate, the concept is that the value of land is often influenced by the quality and nature of the improvements made to it.

The other choices fall short of this comprehensive definition. For example, "property" is a broader term that can refer to any ownership interest, including personal property, which is not included in the definition of real estate. "Improvement" refers specifically to the enhancements made to the land, but does not cover the land itself. Lastly, "land" alone is just one component of real estate and does not account for the improvements, making it an incomplete answer in this context.