Changes in Excel default characteristics apply only to:

A. The Current workbook
B. The Current worksheet
C. New Workbooks
D. Old Workbooks

The answer is C

Depending on how you define default characteristics, I can change, say, column width at any time and it applies to the current workbook. I would choose A, but perhaps your text defines "default" differently.

To determine the correct answer, we need to understand how changes in Excel default characteristics apply. In Excel, default characteristics refer to the default settings and formatting options that are applied to new workbooks when they are created.

To confirm the answer, we can perform the following steps in Excel:

1. Open Excel and create a new workbook by clicking on "File" in the top left corner, then selecting "New" and "Blank Workbook".
2. Make some changes to the default characteristics, such as changing the font size or applying a specific cell format.
3. Save and close the new workbook.
4. Open a different existing workbook, which we'll refer to as an "old workbook".
5. Create another new workbook by repeating step 1.
6. Check if the changes made to the default characteristics in step 2 are applied to this new workbook.

Based on the observation, the changes made to the default characteristics in step 2 only apply to the new workbook created in step 5. This indicates that changes in default characteristics apply to new workbooks, hence the correct answer is C.