Which of the following is the main centre of All India Radio in Jharkhand?

The correct answer is A. Ranchi.

All India Radio (AIR) is the national public radio broadcaster of India. It is a division of Prasar Bharati, the public service broadcaster of India. AIR has a network of over 400 stations across India and broadcasts in 24 languages and 122 dialects.

The main centre of AIR in Jharkhand is located in Ranchi. The station was established in 1948 and broadcasts a variety of programs, including news, music, entertainment, and education. The station also has a number of regional language services.

Bokaro, Dhanbad, and Hazaribagh are all cities in Jharkhand, but they do not have main centres of AIR.