Correct option is A
The correct chronological sequence is as follows:
C (Release of talkie film 'Alam Ara'): The first Indian talkie film, Alam Ara, was released in 1931, marking the beginning of the sound era in Indian cinema.
D (Change of name of Radio Broadcasting to All India Radio): The Indian Broadcasting Company was renamed to All India Radio in 1936, reflecting the nation's shift toward more structured state-controlled radio broadcasting.
A (Start of external services of All India Radio): The external services of All India Radio began in 1939 to reach international audiences and to broadcast to neighboring countries.
B (Establishment of Film Division): The Film Division was established in 1948 to produce documentaries, films, and newsreels, thus promoting the growth of the film industry in India.
Information Booster:
Alam Ara (1931) was the first Indian talkie film, revolutionizing Indian cinema by introducing sound to films.
The renaming of the radio service to All India Radio (1936) marked a formalization of the national broadcasting service.
External services of All India Radio, started in 1939, aimed at international outreach, broadcasting programs for India’s diaspora and neighboring countries.
The Film Division of India, established in 1948, was essential in the promotion of films that helped in educating the public and showcasing Indian culture.