what is this an example of? value contrast shades of black tints of white value scale

what is this an example of? value contrast shades of black tints of white value scale
Answer
Brief Explanations:
A value scale shows a range of values from light to dark. The image with different - toned squares represents a progression of values, which is characteristic of a value scale. It is not just about value contrast (which is about the difference between light and dark), shades of black (which would be only dark values), or tints of white (which would be only light - colored values).
Answer:
D. Value scale