The correct answer is d) Iron Age.
Megaliths are large stones that have been erected by humans. They are found in many parts of the world, and they date back to different periods of history. The megaliths found in Kerala are believed to date back to the Iron Age.
The Iron Age is a period of human history that began with the development of iron metallurgy. It is characterized by the use of iron tools and weapons, as well as by the development of new agricultural techniques. The Iron Age began in different parts of the world at different times, but it is generally thought to have begun in the Middle East around 1200 BC.
The megaliths found in Kerala are believed to have been built by the people who lived in the region during the Iron Age. These people were known as the Cheras, and they were a powerful kingdom that ruled over much of Kerala for centuries. The megaliths are thought to have been used for religious purposes, and they may have been used as tombs for important people.
The megaliths found in Kerala are a valuable source of information about the history of the region. They provide evidence of the people who lived in Kerala during the Iron Age, and they show the development of new technologies and ideas during this time.
The other options are incorrect because they do not correspond to the period of history when megaliths were built. The Paleolithic Age is the earliest period of human history, and it is characterized by the use of stone tools. The Mesolithic Age is a period of transition between the Paleolithic Age and the Neolithic Age, and it is characterized by the development of new hunting and gathering techniques. The Neolithic Age is a period of agricultural development, and it is characterized by the use of domesticated plants and animals.