Which of the following mass media is considered less expensive and more effective than others for educational communication of non-literates?

Radio is held to be less expensive and more effective than the others for the educational communication of non-literates.

It needs no reading ability, so its spoken word reaches people who cannot use print.

Its low cost and wide rural reach let it carry learning to scattered and remote audiences cheaply.

Television is costlier and depends on power supply and sets that many non-literate households lack.

Newspapers demand literacy and so shut out the very learners in question.

Films need theatres or projection and are far more expensive to produce and distribute.