The correct answer is (a) natural resources.
Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs. It is a case of inter-generational sensibility in respect of use of natural resources. Natural resources are the basic materials and energy sources that are essential for human survival and economic development. They include air, water, soil, minerals, forests, and wildlife.
Natural resources are finite and non-renewable, meaning that they cannot be replaced once they are used up. They are also essential for the functioning of the Earth’s ecosystems. If we continue to use natural resources at the current rate, we will eventually deplete them, which will have a devastating impact on the environment and on human society.
It is therefore essential that we develop in a sustainable way, so that we can meet the needs of the present without compromising the ability of future generations to meet their own needs. This means using natural resources wisely and efficiently, and investing in renewable energy sources. It also means protecting the environment and ensuring that natural resources are used in a way that is fair and equitable.
The other options are incorrect because they are not essential for human survival and economic development. Material resources are things like metals, plastics, and wood. Industrial resources are things like machines, tools, and factories. Social resources are things like education, healthcare, and infrastructure.