The correct answer is (c), Tarai-Bhabar.
The Kham system was a revenue system introduced by the British Administration in the Tarai-Bhabar region of Uttarakhand in the 19th century. It was a system of land tenure in which the land was held by the government and leased to tenants on a yearly basis. The tenants were responsible for paying a fixed rent to the government, and they were also required to provide labor services to the government.
The Kham system was a controversial system, and it was eventually abolished in the early 20th century. However, it had a significant impact on the development of the Tarai-Bhabar region, and it continues to be a topic of debate among historians and social scientists.
The other options are incorrect because they are not areas of Uttarakhand where the Kham system was introduced.
(a) Rawain is a tehsil in the Chamoli district of Uttarakhand.
(b) Jaunpur is a district in the Uttar Pradesh state of India.
(d) Bhotantik Area is a region in the Kumaon division of Uttarakhand.