A. When grey is added to a color
B. When black is added to a color
C. When white is added to a color
D. None of the above

Solution

A. When grey is added to a color

Explanation

Tones in images, particularly in black and white images, are created through variations in brightness. The concept of tones refers to the different shades of gray between pure black and pure white. In digital images, tones are represented by pixel values, with 0 typically representing black, 255 representing white, and values in between representing different shades of gray.