The correct answer is A. Text box tool.
The text box tool is a tool that allows you to add text to a slide without using the standard placeholders. You can use the text box tool to add text anywhere on a slide, and you can resize and format the text box as needed.
The line tool is a tool that allows you to add lines to a slide. You can use the line tool to add straight lines, curved lines, and freehand lines.
The fill color is a tool that allows you to change the color of a slide’s background. You can use the fill color tool to change the background color to a solid color, a gradient, or a picture.
The Auto Shapes tool is a tool that allows you to add shapes to a slide. You can use the Auto Shapes tool to add basic shapes, such as circles and squares, or more complex shapes, such as arrows and stars.