Final answer:
The most helpful feature for Isabella to remember the names of different buttons on the Ribbon is ScreenTips, as they provide brief explanations of each tool when hovered over.
Step-by-step explanation:
If Isabella is having difficulties remembering the names of different buttons on the Ribbon in a program like Microsoft Office, the feature that might be the most helpful for her is c. ScreenTips. ScreenTips are small pop-up descriptions that appear when you hover your mouse over any button or feature in the Ribbon. They provide a brief explanation or the name of the button's function, which can aid in learning and memorizing the various elements of the Ribbon interface. Unlike the Title bar, which displays the name of the document and the program, or the Worksheet tabs, which allow you to navigate between different sheets in a workbook, or the Formula bar, which is used to enter or edit data and formulas in cells, ScreenTips are specifically designed to offer instant contextual information about the Ribbon's tools, hence improving user familiarity with the interface.