The answer is B. dot pitch.
Dot pitch is the distance between the centers of the phosphor dots of the same color on a display device. It is a measure of the sharpness of an image on a display device. A lower dot pitch means that the phosphor dots are closer together, which results in a sharper image.
Refresh rate is the number of times per second that the image on a display device is refreshed. A higher refresh rate results in a smoother image.
Resolution is the number of pixels that make up an image. A higher resolution results in a sharper image.
Color depth is the number of bits used to represent each pixel. A higher color depth results in a more realistic image.
None of the above is the correct answer.