Concept:Sustainable development means meeting today's needs without harming future generations' ability to meet their own needs.
Explanation:It balances economic growth, social progress, and environmental protection.
This is achieved by conserving all kinds of resources—both renewable (solar, wind) and non‑renewable (oil, gas)—using them only as per requirement, and saving them for the future.
It also includes reducing pollution and protecting natural habitats.
Thus, sustainable development is not just about limited use, conservation of only renewables, or saving for family; it is about responsible use of all resources for present and future needs.
Answer:Option D: Conserve all kinds of resources, use only as per requirement and save for future.