Which one of the following can we consider to be truly audio visual

No idea.

To determine which one of the options can be considered truly audio visual, we need to understand the definition of audio visual. Audio visual refers to anything that involves both sound and visual elements, working together to convey a message or create an experience. Let's examine the options and see which one fits this definition best:

1. Television: Television is a classic example of an audio visual medium. It combines visual images with audio (sound) to create a complete viewing experience.

2. Radio: Radio, on the other hand, is primarily an auditory medium. While it does involve sound, it lacks the visual component that defines audio visual.

3. Printed Book: Printed books are purely visual and do not involve sound. They might have written words, illustrations, or images, but they are not considered audio visual.

4. Movie Theater: Movie theaters provide a truly audio visual experience. They combine high-quality visuals presented on a large screen with surround sound audio.

Based on these descriptions, the option that can be considered truly audio visual is the "Movie Theater."

To arrive at this answer, I analyzed the characteristics of each option and compared them against the definition of audio visual. It is important to note that the answer may be subjective, and different interpretations of audio visual could lead to different conclusions.