Explanation: Electromagnetic interference (EMI) or radio frequency interference (RFI) can couple into the sensitive control circuitry or data lines of an LCD display. These unwanted signals add to or subtract from the intended digital data and analog voltages that determine pixel states and brightness. When noise corrupts the data signals controlling individual pixels, it can cause them to display incorrect colors or states intermittently, leading to **erratic video** such as flickering, jumbled patterns, or distorted images. Similarly, if noise interferes with the voltage levels controlling the backlight or the liquid crystal cells' transparency, it can cause sudden, unintended variations in brightness, manifesting as **sharp changes in intensity**. Options B and C are generally incorrect as direct visual manifestations of noise *on the LCD itself*. Black spots typically indicate dead pixels or physical damage, not dynamic noise. Changes in bearings refer to navigation data, and while noise can affect the accuracy of *displayed* bearing information, it doesn't describe the visual artifact directly appearing *on* the LCD screen.