The earliest evidence of human presence in Arunachal Pradesh dates back to the Lower Paleolithic Period.
The Lower Paleolithic Period is the earliest part of the Paleolithic or Old Stone Age. It covers the time from around 2.58 million years ago to around 300,000 years ago. During this time, humans were hunter-gatherers who used simple stone tools.
The first evidence of human presence in Arunachal Pradesh was found in the form of stone tools. These tools were found in the Siang Valley and are dated to around 2.5 million years ago. This makes them some of the oldest stone tools found in India.
The discovery of these tools suggests that humans were living in Arunachal Pradesh during the Lower Paleolithic Period. This is an important finding as it shows that humans were present in India at a very early stage in their evolution.
The other options are incorrect because they are not associated with the Lower Paleolithic Period. The Upper Paleolithic Period is the period from around 50,000 years ago to around 10,000 years ago. During this time, humans began to make more sophisticated stone tools and to develop agriculture. The Neolithic Period is the period from around 10,000 years ago to around 4,500 years ago. During this time, humans began to live in permanent settlements and to domesticate animals. The Bronze Age is the period from around 4,500 years ago to around 3,200 years ago. During this time, humans began to use bronze tools and weapons.