The correct answer is D. The interior of Australia has seen very few settlements primarily because it lacks sufficient water and arable land. The harsh and dry climate of the region makes it very challenging for agriculture and sustaining human habitation. There are limited water resources, making it difficult for communities to establish and thrive in this arid environment. Additionally, the lack of mineral wealth (option A) or expensive land (option B) are not the main reasons for the low population in the interior of Australia. While it is true that the area can be dangerous in terms of extreme weather conditions and isolation, these factors are not the primary reasons for the limited settlements in the region.
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