Final answer:
Economic Development is of least importance when concerning ecosystem preservation, as the core focuses are biodiversity, environmental stability, and habitat conservation.
Step-by-step explanation:
Among the options given, C. Economic Development is of least importance when concerning the preservation of ecosystems. Preservation of ecosystems primarily focuses on the biodiversity, environmental stability, and habitat conservation. Economic development, while it can indirectly affect ecosystems, is not a direct factor in ecological preservation. Biodiversity is essential for maintaining a resilient ecosystem with numerous species contributing to various functions and services. Environmental stability is key for the long-term health of an ecosystem. Habitat conservation is crucial for protecting the living spaces of species and maintaining ecological integrity. Conversely, economic development can sometimes be at odds with conservation efforts, as it often involves the alteration or exploitation of natural habitats for human interests.