Answer: (C) Highlighting
Step-by-step explanation:
Highlighting is the process in which we can use the different effects of the color for highlight the background and also used for emphasize the text. Highlight is very useful in highlighting the important line, text and any kind of special word.
It is mostly used for draw attention towards the important sentence in the given whole page or paragraph by highlighting some important line or words.
On the other hand, all the other options are incorrect as they does not involve in the color effect for emphasize the text.
Therefore, (C) is correct option.