Step 1: Historical background.
Radio broadcasting in India began with private efforts. The first broadcast was made by the Radio Club of Bombay in 1923.
Step 2: Analyzing the options.
(A) Radio Club of Delhi: Incorrect.
(B) Radio Club of Calcutta: Incorrect.
(C) Akashvani: Name given later (after independence).
(D) Radio Club of Bombay: Correct.
Step 3: Conclusion.
Thus, radio broadcasting in India was started by the Radio Club of Bombay.