The distance from one pixel to the next pixel is called Resolution.

Explanation:
- The resolution of an image or display refers to the number of pixels that it contains. It represents the sharpness and clarity of the image.
- The resolution is determined by the number of pixels horizontally and vertically in the image or display. For example, a display with a resolution of 1920x1080 has 1920 pixels horizontally and 1080 pixels vertically.
- The distance from one pixel to the next pixel can be understood as the physical distance between adjacent pixels on a display.
- This distance is commonly referred to as the resolution. It determines the level of detail that can be displayed on the screen.
- Higher resolutions generally result in sharper and more detailed images, as there are more pixels packed into the same physical space.
- Conversely, lower resolutions have fewer pixels and may appear less sharp or pixelated.
- The resolution is typically measured in pixels per inch (ppi) or dots per inch (dpi).
- PPI refers to the number of pixels in a one-inch line of the display, while DPI refers to the number of dots (ink dots in printing) in a one-inch line.
- Dot Pitch, on the other hand, refers to the distance between the centers of two adjacent pixels on a display. It is measured in millimeters (mm) and represents the physical size of each pixel.
- Pixmap, short for pixel map or pixel array, refers to the representation of an image as an array of pixels.
- Therefore, the correct answer is option 'A' - Resolution.