The correct answer is: a) Hand axes and stone tools.
The Garo Hills are a mountain range in the Indian state of Meghalaya. The region is home to a number of prehistoric sites, including the one mentioned in the question. This site is known for its hand axes and stone tools, which are believed to have been used by early humans.
Hand axes are a type of stone tool that is characterized by its bifacial flaking. This means that the tool has been flaked on both sides, resulting in a symmetrical shape. Hand axes were used for a variety of purposes, including hunting, butchering, and woodworking.
Stone tools are a general term for any tool that is made of stone. Stone tools were used by early humans for a variety of purposes, including hunting, butchering, and woodworking. Stone tools can be divided into two main categories: flaked tools and ground tools. Flaked tools are made by flaking off small pieces of stone from a larger piece. Ground tools are made by grinding and polishing a piece of stone.
The Garo Hills are a significant archaeological site because they provide evidence of early human activity in the region. The hand axes and stone tools found at this site are believed to have been used by early humans who lived in the area thousands of years ago. These tools provide valuable insights into the lives of these early humans and their cultures.
The other options are incorrect because they do not accurately describe the site mentioned in the question. Dolmens and menhirs are types of megalithic monuments, while pottery fragments and rock art are types of artifacts that can be found at prehistoric sites. However, these items are not specifically associated with the site mentioned in the question.