I'm not sure in what context you mean, but think about how they act or their core characters. What standards do they follow? Any stereotypes? Are they predictable? If so, in what way?
The second option is 100% the correct answer
Where are the words ? Can I see the whole question
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Answer:
Sustainability is the method of using a resource to ensure its long term availability.
Explanation:
It is the balance between the human and ecosystem, the use f resources in a manner that they are not depleted.
Sustainability has been a matter of concern especially in the environmental protection and development debate. The idea being, advancement in development with means that ensure a safe environment for its conservation so as to ensure its continuity for the benefit of current and future generations.