In a TV monitor, interlaced scanning is primarily used to reduce?

Interlaced scanning is a technique used in television and video displays to enhance image quality by effectively reducing flicker. This method works by dividing the frame into two fields, displaying alternate lines sequentially. When this happens, the full image is presented in a manner that takes advantage of the human eye's persistence of vision, allowing for smoother motion perception while also diminishing flicker.

By updating only half of the lines at a time, interlaced scanning requires less bandwidth than progressive scanning, which updates all lines in each frame. This is particularly beneficial in television broadcasts where maintaining a stable and flicker-free image is crucial for viewer comfort. The approach not only makes the viewing experience more pleasant but also helps in managing the transmission of video signals effectively.

The other options, such as quantum mottle, distortion, and low brightness levels, do not align with the primary purpose of interlaced scanning. Quantum mottle relates to graininess in radiographic images due to insufficient photon counts, distortion pertains to the inaccuracies in image rendering, and low brightness levels are more associated with the output of the display system than the scanning method employed.