How did All India Radio culturally expand Bismillah Khan's shehnai?

Correct answer: It turned local performance into a national listening experience

All India Radio expanded the reach of Bismillah Khan’s shehnai by carrying his performances beyond the immediate spaces of Banaras and concert venues. Radio allowed people across the country to hear an instrument and an artist that might previously have been known mainly through local or ceremonial settings. In this way, technology served cultural transmission: it preserved the connection with his tradition while giving it a national audience. Option A is correct because it describes this movement from local performance to shared national listening. Options B and C state the opposite of radio’s effect, while D is also wrong because wider broadcasting did not erase his attachment to Banaras.