The correct answer is A. Telugu.
Telugu is an Indian language spoken by about 80 million people, mainly in the Indian state of Telangana. It is the official language of Telangana and Andhra Pradesh. Telugu is a Dravidian language, and is closely related to Kannada, Malayalam, and Tamil.
Urdu is an Indo-Aryan language spoken by about 120 million people, mainly in Pakistan and India. It is the official language of Pakistan. Urdu is a descendant of Hindi, and is written in the Perso-Arabic script.
Hindi is an Indo-Aryan language spoken by about 500 million people, mainly in India. It is the official language of India. Hindi is written in the Devanagari script.
Marathi is an Indo-Aryan language spoken by about 80 million people, mainly in the Indian state of Maharashtra. It is the official language of Maharashtra. Marathi is written in the Devanagari script.
Telugu is the official language of Telangana because it is the language spoken by the majority of the population of the state. Telugu is also a rich and vibrant language with a long history and culture.