The correct answer is: a) Neolithic.
The Neolithic period is the final stage of the Stone Age, when humans began to develop agriculture and settle in permanent villages. This period began in different parts of the world at different times, but in India it is generally thought to have started around 7000 BC.
The Mesolithic period is the period between the Paleolithic and Neolithic periods, when humans were still hunter-gatherers but were beginning to develop some agricultural practices. This period lasted from around 10,000 to 7000 BC in India.
The Paleolithic period is the earliest period of the Stone Age, when humans were hunter-gatherers and did not have agriculture. This period lasted from around 2.5 million to 10,000 BC in India.
The Harappan period is a Bronze Age civilization that flourished in the Indus Valley from around 2600 to 1900 BC. This civilization was not agricultural, but rather based on urban centers with complex social and economic systems.
The beginning of settled village life and agriculture in Gujarat marks the Neolithic period. This period was characterized by the development of agriculture, the domestication of animals, and the construction of permanent settlements. The Neolithic period was a time of great change for humans, as they began to move away from a hunter-gatherer lifestyle and towards a more settled way of life.