The correct answer is option 'A' - Sustainable development.

Explanation:
Sustainable development refers to the practice of using resources in a way that meets the needs of the present generation without compromising the ability of future generations to meet their own needs. It involves balancing the need to use resources for economic and social development while also conserving them for the future.

To understand this concept in more detail, let's break it down into key points:

1. Balancing the need to use resources:
- Resources such as energy, water, land, and minerals are essential for economic and social development.
- There is a need to use these resources to meet the growing demands of the population, improve living standards, and promote economic growth.

2. Conserving resources for the future:
- Resources are finite and can be depleted or degraded if not managed properly.
- Conserving resources ensures their availability for future generations and protects the environment from overexploitation.
- It involves using resources efficiently, reducing waste and pollution, and adopting sustainable practices in various sectors like agriculture, industry, and transportation.

3. Sustainable development:
- Sustainable development is an approach that aims to achieve a balance between resource use and conservation.
- It involves integrating economic, social, and environmental considerations into decision-making processes.
- The goal is to meet the needs of the present generation while safeguarding the ability of future generations to meet their own needs.

4. Importance of sustainable development:
- Sustainable development promotes long-term economic prosperity, social well-being, and environmental protection.
- It helps to address global challenges such as climate change, biodiversity loss, and resource scarcity.
- By using resources efficiently and responsibly, sustainable development ensures a more equitable and sustainable future for all.

In conclusion, sustainable development is the practice of balancing the need to use resources for present development while conserving them for the future. It is a crucial approach for achieving economic growth, social progress, and environmental sustainability.

Correct option is (A). The means of Sustainable Development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs. In other words, the development being conducted without depleting natural resources.