Questions: To help readers, the use of underlining, boldface, italics, and lists are all ways to provide variety. purpose. tone. emphasis.

The answer is emphasis: the original text in the question...

Explanation for each option:

• Variety: This option is incorrect because while underlining, boldface, italics, and lists can add variety to a text, their primary purpose is not to provide variety. They are used more for highlighting specific parts of the text.

• Purpose: This option is incorrect because purpose refers to the reason why something is done. The use of these formatting tools is not to convey purpose but to highlight or draw attention to certain parts of the text.

• Tone: This option is incorrect because tone refers to the attitude or feeling conveyed by the writing. While formatting can sometimes influence the tone, it is not the primary function of underlining, boldface, italics, and lists.

• Emphasis: This option is correct because the primary function of underlining, boldface, italics, and lists is to emphasize certain parts of the text. They help draw the reader's attention to important information or highlight key points.