Final answer:
With a 24-bit color depth setting in Windows, 16,777,216 colors can be displayed, which is the result of 256 levels of color per each of the three RGB channels multiplied together.
Step-by-step explanation:
If the color depth in Windows is set to 24-bit, the number of colors that can be displayed is 16,777,216. This is calculated by raising 2 to the power of the color depth per channel, and since standard RGB coloring uses three channels (Red, Green, and Blue), we calculate 224 by doing 28 (which is 256) for each channel and then multiplying the three results together: 256 x 256 x 256. Therefore, the correct answer is C. 16,777,216.