Answer:
The correct answer is - Sustainability.
Explanation:
Sustainability is the ability to sustain at a constant rate. It is normally explains the ability of biosphere and human to coexist over the particular time period. Sustainability is the condition in which the human population can co-exist constant over time due to the need of human are met.
Other three options are not suitable as biodiversity explains the different type of life present in a particular area. Environmentalism is related to overall environmental conditions. Population growth is a growth in population over time due to some other conditions.
Thus, the correct answer is - Sustainability.