If a column has a width of 0 (zero), then the column is __________ in an Excel worksheet.

Correct option is B

In an Excel worksheet, if the column width is set to 0, the column becomes hidden and cannot be seen in the spreadsheet until unhidden.
Important Key Points:
1. Hidden Column: Setting a column's width to 0 effectively hides it from view. Users can unhide it by adjusting the width back to a positive value.
2. Highlighting and Copying: These operations do not make a column disappear; only setting the width to 0 or explicitly hiding it does.
Knowledge Booster:
· Hiding vs Deleting: Hiding a column does not delete data—it simply removes the column from the current view.
· Shortcut to Unhide Columns: Select the adjacent columns to the hidden one, then right-click and select Unhide to make it visible again.