How did radio plays help develop the sound engineering industry

Broadcast and sound engineering technicians and radio operators perform a wide variety of tasks. Their duties include setting up and maintaining the electrical equipment used in nearly all radio and television broadcasts, concerts, plays, sound recordings, and movies. There are many specialized occupations in this field.

Explanation: Broadcast technicians set up, operate, and maintain equipment that regulates the signal strength, the clarity, and the ranges of sounds and colors of radio or television broadcasts. These technicians also operate control panels to select the source of the material. Technicians may switch from one camera or studio to another, from film to live programming, or from network to local programming.

i think the answer could be either a or b because both are part of the post production part. hopefully this you a little.

eurasia because it is europe and asia