The correct answer is (a) Neolithic Age.
The Neolithic Age is the final stage of the Stone Age, when humans began to practice agriculture. This led to a number of changes in human society, including the development of permanent settlements, the rise of social stratification, and the development of new technologies.
The Mesolithic Age is the period between the Paleolithic Age and the Neolithic Age. During this time, humans began to transition from a hunter-gatherer lifestyle to a more settled agricultural lifestyle. This transition was gradual, and there was a great deal of variation in how different cultures adapted to the new way of life.
The Paleolithic Age is the earliest period of human history, when humans lived as hunter-gatherers. This period lasted for millions of years, and during that time humans developed a number of important technologies, including the use of fire and the development of stone tools.
The Proto-Historic Age is the period of time between the end of the Paleolithic Age and the beginning of the Historic Age. During this time, humans began to develop writing systems, which allowed them to record their history and culture. This development led to the rise of civilizations, which are complex societies with a high level of social organization.
In conclusion, the cultivation of cereals first started in the Neolithic Age. This was a time of great change for human society, as it led to the development of agriculture, permanent settlements, social stratification, and new technologies.