What effect did All India Radio have on Bismillah Khan's art?

Correct answer: It carried his shehnai to a wider audience.

The governing concept is the role of mass communication in expanding the reach of an artist. All India Radio broadcast Bismillah Khan’s shehnai performances, so listeners outside the concert hall and beyond his immediate locality could hear his music. This helped make his artistry widely known and contributed to the recognition of the shehnai as a serious classical instrument. Option A is therefore correct because it describes the positive effect of broadcasting: a larger audience and wider cultural influence. Options B and C reverse the effect, since radio supported rather than restricted his art. Option D is unrelated; the question concerns the spread of his music, not a prohibition on foreign travel.