What is the font color that needs to be changed to gray 25% background 2?

The correct answer is the third option in the first row under theme colors, which represents the gray 25% background 2 color setting in PowerPoint's theme color palette. In design principles, using a specific percentage of a color, such as gray at 25%, is important for maintaining readability while ensuring that text is not overpowering or difficult to see against the background.

Typically, color selection in PowerPoint is based on the theme you are using, and the standard theme colors are organized in a grid format. The first row usually contains a range of base colors, with lighter shades progressing into darker tones, and this organization helps users easily identify and apply consistent color schemes throughout their slides. Gray 25% from the theme color set is particularly relevant for achieving a subtle but clear contrast against a white background or lighter backgrounds in your presentation, thus serving both aesthetic and functional roles in the design of slides.