Final answer:
The option that allows you to change the justification of text when using a text tool is the 'Justification' option. This feature aligns the content within a text box, and can be set to left, center, right, or justify, affecting both readability and layout.
Step-by-step explanation:
When working with a text tool in various software applications, the option that allows you to change the justification of your text is indeed the Justification option. This feature aligns text within a text box or space on the page, and it can generally be found in the paragraph settings of a text editing interface. When you adjust the justification settings, you can align your text to the left, center, right, or justify it (which spreads the text evenly across the width of the text box). Adjusting text justification can influence the readability as well as the aesthetic layout of your text, playing a role alongside other textual elements such as rhyme, paragraphing, italics, and proximity.
Options like Font Size and Line Height affect the size of the text and the space between lines, respectively, while Character Spacing (also known as letter spacing or tracking) refers to the space between individual characters. These elements contribute to the overall text space usage, how much space a character or a line takes up on the page, affecting the visual impact and readability of written content.