Final answer:
The bad example of contrast from the given options is Black text on a dark blue background. This is a bad example because the contrast between the text color and the background color is too low, making it difficult to read the text.
Step-by-step explanation:
The bad example of contrast from the given options is Black text on a dark blue background. This is a bad example because the contrast between the text color and the background color is too low, making it difficult to read the text. In order to create an effective contrast, it is important to choose colors that have a significant difference in brightness or hue.