The correct answer is (a) Chopani-Mando.
Chopani-Mando is a Mesolithic archaeological site located in the Belan Valley of the Vindhya Range in India. It is dated to around 8,000 years ago. The site is significant for its evidence of early human habitation, including the remains of a hut, stone tools, and bone implements.
The other options are incorrect because they are not Mesolithic sites. Kakoria is a Neolithic site located in the Ganges Plain. Mahadaha is a Chalcolithic site located in the Yamuna Valley. Sarai Nahar Rai is an Iron Age site located in the Ganges Plain.
Bone implements are tools made from animal bones. They were used by early humans for a variety of purposes, including hunting, butchering, and woodworking. Bone implements are often found at archaeological sites, and they can provide valuable information about the lives of early humans.