Option 1 -> While the passage mentions balanced and harmonious environment as a result of rich biodiversity, it doesn't state this as essential for developing it.
Option 2 -> Economic growth is not mentioned in the passage as a factor for developing biodiversity.
Option 3 -> The passage explicitly states "A healthy environment is essential for developing rich biodiversity."
Option 4 -> Urbanization is not mentioned; the passage suggests human technological advancement has been harmful to biodiversity.
Hence, Option 3: A healthy environment -> The passage directly concludes that "A healthy environment is essential for developing rich biodiversity which in turn is essential for the human beings to live in a harmonious state on Earth." This statement clearly identifies a healthy environment as the key prerequisite for rich biodiversity. -> correct