In MS-Word to highlight text, line or any paragraph, you use:

The correct answer is Background Shade. In MS-Word, applying a background shade to text, a line, or a paragraph effectively highlights it by changing the color of the area behind the text, similar to using a physical highlighter pen.

• Different Font Color changes the color of the text characters themselves, not the background area.
• Bold makes the text thicker and darker for emphasis, but it does not apply a background color.
• Font Effects is a broader category that includes options like strikethrough, superscript, or subscript, but 'Background Shade' is the specific feature for applying a colored background to highlight text.