The correct answer is: B. Indo-European
Hindi is an Indo-Aryan language, a branch of the Indo-European language family. It is the fourth most spoken language in the world, with over 500 million speakers. Hindi is the official language of India and is also spoken in Nepal, Pakistan, and Fiji.
Sino-Tibetan is a language family that includes Chinese, Tibetan, Burmese, and many other languages spoken in East Asia. Tibeto-Burman is a language family that includes Tibetan, Burmese, and many other languages spoken in South Asia and Southeast Asia.
None of the above is not a correct answer.