The correct answer is (c) Dhankha.
Thapla is a Neolithic site located in the Kumaon region of Uttarakhand. It is dated to the 6th millennium BCE. The site has yielded evidence of a well-developed agricultural economy, as well as a variety of stone tools and pottery.
Ranihat is a Chalcolithic site located in the Garhwal region of Uttarakhand. It is dated to the 3rd millennium BCE. The site has yielded evidence of a copper-based metallurgy industry, as well as a variety of stone tools and pottery.
Barahoti is a Mesolithic site located in the Kumaon region of Uttarakhand. It is dated to the 8th millennium BCE. The site has yielded evidence of a hunting and gathering economy, as well as a variety of stone tools.
Dhankha is not an archaeological site of Uttarakhand.