Economic characteristics of land can be described as:

Economic characteristics of land refer to attributes that are influenced by human involvement and the market. They encompass aspects such as value, use, and the ability to generate income. Man-made features include improvements and developments that increase the land's utility and economic potential, such as buildings, roads, and infrastructure.

The correct identification of man-made contributions highlights the importance of human intervention in shaping the economic landscape, which is significantly different from natural characteristics that are inherent to the land itself. For example, options that denote environment-specific or natural qualities fail to capture the economic implications of how land is utilized and developed through human activity.