Answer:
The correct answer is option c.
Explanation:
The term 'invisible hand' was coined by the economist Adam Smith in his book "Wealth of nations". It refers to the invisible market force that helps the economy to reach the equilibrium.
This invisible force though powerful is not perfect. In some cases, it fails to achieve efficiency which leads to market failure. In such situations, government intervention is necessary to efficiently allocate resources in the economy. So even in a market economy, we need government.