Final answer:
The correct Hexadecimal code for the color white is #FFFFFF, as it represents the highest levels of red, green, and blue (RGB), which is option 'A'.
Step-by-step explanation:
In hexadecimal color codes, the color white is represented when red, green, and blue (RGB) are at their highest levels. Hexadecimal codes are written as #RRGGBB, where RR is the red component, GG is the green component, and BB is the blue component, with each pair ranging from 00, which is the lowest intensity, to FF, which is the highest intensity.
Thus, to achieve white, which is the brightest and the most saturated combination of all colors, the code is #FFFFFF, which corresponds to 'A' from the given options.
This is because white combines all the colors of the spectrum at their maximum saturation and highest intensity, resulting in the absence of shadow, which is indicated by the hexadecimal values.