How is flicker in the television picture avoided?

Flicker in the television picture is primarily avoided through the implementation of techniques that ensure the smooth delivery and display of video content. The correct answer encompasses multiple methods that effectively eliminate flicker.

Using interlaced scanning helps to reduce flicker by displaying odd and even lines in alternating sequences, creating a perception of a complete image at a higher frame rate. This method allows a viewer to see a more stable picture since the entire image is not refreshed at once but rather incrementally.

Synchronizing the video signal between the camera and the monitor is also essential in minimizing flicker. This synchronization ensures that the timing for how the image is captured and displayed is aligned, preventing any discrepancies that could lead to flickering or other visual artifacts.

Scanning the odd lines first and then the even lines is a part of the interlaced scanning process. It contributes to the overall flicker reduction by ensuring that each successive refresh of the image builds upon the previous one, maintaining visual continuity and stability.

Thus, the combination of using interlaced scanning, synchronizing signals, and the specific line scanning technique all work together to prevent flicker in the television picture, making "All of the above" the most comprehensive and accurate choice.