Resource limits refer to the finite nature of land,water,energy and other ecological assets that support human life. The stem talks about a limit to the number of people Earth can support based on these resources. This is essentially an illustration of resource limits and planetary constraints. Therefore “limits” fits the blank correctly.
Option A:
Abundance suggests resources are more than sufficient,which contradicts the idea that Earth can support only a limited number of people.
Option B:
Limits emphasise that indefinite growth is not possible on a finite planet and directly matches the meaning in the stem.
Option C:
Entropy is a thermodynamics concept and is not the straightforward term used here for population–resource constraints.
Option D:
Privatisation is about ownership/management,not biophysical constraints on how many people can be supported.
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