Microliths were made during the Mesolithic period.

Mesolithic Period
The Mesolithic period, also known as the Middle Stone Age, is a prehistoric period that spanned from approximately 10,000 BCE to 5,000 BCE. During this period, humans transitioned from a hunter-gatherer lifestyle to a more settled way of life, with the development of agriculture and domestication of animals. The Mesolithic period is characterized by the use of microliths, small stone tools that were used for hunting and gathering.

Microliths
Microliths are small stone tools that were used by humans during the Mesolithic period. They were made by chipping or flaking a larger stone to create a small, sharp blade or point. These tools were used for hunting small game, such as rabbits and birds, as well as for cutting and scraping plant materials. Microliths were often used in composite tools, such as spears, arrows, and harpoons.

Importance of Microliths
Microliths were an important technological innovation during the Mesolithic period, as they allowed humans to hunt and gather more efficiently. They were also used in the construction of shelters and other structures. The use of microliths marked a significant advancement in human tool-making and helped to lay the foundation for the development of more advanced technologies in the future.

Conclusion
In conclusion, microliths were made during the Mesolithic period, which spanned from approximately 10,000 BCE to 5,000 BCE. These small stone tools were an important innovation that allowed humans to hunt and gather more efficiently and marked a significant advancement in human tool-making.

The correct answer is (b)- Mesolithic
A microlith is a small stone tool usually made of flint or chert and typically a centimetre or so in length and half a centimetre wide.