Which of the following option is the correct measure for India to become one of the biggest economies in the world?

Spend more on infrastructural development

The correct option is Option 3: Spend more on infrastructural development.

Investing in infrastructural development is crucial for economic growth as it improves connectivity, enhances productivity, attracts investments, and supports other sectors like agriculture, manufacturing, and services, ultimately contributing to making India one of the biggest economies in the world.