Discussion
................ is an electronic audio-visual medium which provides pictures with synchronized sound.
Answer: D
The medium is television.
Television transmits moving pictures and synchronised sound electronically, which is exactly the description. It is an audio-visual mass medium that can show demonstrations of farm and home practices to large audiences.
Radio and a tape recorder provide sound only, so they are audio aids. An LCD projector displays images from a source such as a computer, but it is a projection device rather than a medium broadcasting pictures with synchronised sound.
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