The discovery of megalithic structures in Arunachal Pradesh indicates:

The correct answer is: d) All of the above

Megalithic structures are large stone monuments that were built by ancient peoples. They are found all over the world, and they come in a variety of shapes and sizes. Some megalithic structures are burial chambers, while others are temples or monuments.

The discovery of megalithic structures in Arunachal Pradesh indicates that the people who lived there had a complex social organization, as well as ritual and ceremonial practices. The structures are also evidence of the people’s astronomical knowledge, as they are often aligned with the sun, moon, or stars.

Here is a brief explanation of each option:

• Complex social organization: Megalithic structures are often found in clusters, which suggests that the people who built them lived in organized communities. The structures themselves can be quite complex, which suggests that the people who built them had a sophisticated understanding of engineering and architecture.
• Ritual and ceremonial practices: Megalithic structures are often associated with burials or other rituals. For example, some megalithic structures are found in cemeteries, while others are found in areas that were once used for religious ceremonies. The presence of megalithic structures suggests that the people who built them had a strong belief in the afterlife and in the power of ritual.
• Astronomical knowledge: Some megalithic structures are aligned with the sun, moon, or stars. This suggests that the people who built them had a sophisticated understanding of astronomy. For example, the stone circles at Stonehenge in England are aligned with the summer solstice. This suggests that the people who built Stonehenge were aware of the importance of the summer solstice as a time of year for religious ceremonies.

In conclusion, the discovery of megalithic structures in Arunachal Pradesh indicates that the people who lived there had a complex social organization, as well as ritual and ceremonial practices. The structures are also evidence of the people’s astronomical knowledge.