What does a Cathode Ray Tube (CRT) primarily utilize to transmit images?

The cathode ray tube (CRT) primarily utilizes electron beams to transmit images. In a CRT, an electron gun emits a stream of electrons that are directed towards a phosphorescent screen. When the electrons hit the screen, they excite the phosphor coating, which emits light and creates an image. This technology relies on the precise control of the electron beams, allowing for the display of images by scanning across the screen in a systematic manner.

The other options do not accurately describe the fundamental technology of a CRT. Transistors are used in various electronic circuits but are not the primary mechanism in a CRT for image transmission. Lasers are associated with different types of display technologies, such as laser projectors and certain types of televisions, but are not part of the CRT operation. LED technology also pertains to modern display methods, like LED LCD screens, which are distinctly different from how a CRT functions. Thus, the use of electron beams is the defining characteristic of a cathode ray tube's image transmission process.