Step 1: Recall radio history.
All India Radio (AIR) was officially established in 1936. Before that, broadcasting in India started in 1927 by private companies.
Step 2: Later developments.
In 1957, AIR adopted the name “Akashvani.”
Step 3: Eliminate wrong options.
(A) 1930: Too early.
(C) 1957: Name change only.
(D) 1965: Wrong.
Step 4: Conclusion.
Correct answer: (B) 1936.