The answer is D. Dogri.
The other options are all ethnic groups in India. Santhals are an indigenous people of India who live in the eastern states of Jharkhand, West Bengal, and Odisha. Khonds are an indigenous people of India who live in the eastern states of Odisha and Andhra Pradesh. Bhotias are an ethnic group of Tibeto-Burman peoples who live in the Himalayan region of India, Nepal, and Bhutan. Abors are an indigenous people of India who live in the northeastern state of Arunachal Pradesh.
Dogri is a language spoken by the Dogra people of Jammu and Kashmir. It is a member of the Indo-Aryan language family and is closely related to Punjabi and Hindi. Dogri is the official language of the Jammu and Kashmir state and is also spoken in the neighboring states of Himachal Pradesh and Uttarakhand.
The other options are all ethnic groups in India, while Dogri is a language.