Correct option is A.
CRT stands for Cathode ray tube. Cathode ray tube consists of
- heated metal called cathode at the one end and a control grid
- Focus anode to focus electrons beams emitted from cathode at one point.
- accelerating anode to speed up electrons speed toward phosphorescent screen.
- deflection coils to change the direction of emitted electrons beam depending upon the signal
- And, the phosphorescent screen to create image (light)