Answer:
Biodiversity
Step-by-step explanation:
In the given question, many species of plant species used to grow in the empty lot. The plant species could have provided a home to many animal species. This lot thus formed a small level of the biological ecosystem which is composed of biodiversity.
This lot was changed to a park by the city council which then changed the ecosystem of the area and the main factor that was affected by this change is Biodiversity.
Thus, Biodiversity is correct.