The correct answer is C. Label.
A number is a value that can be represented by a digit or a combination of digits. A character is a single letter, number, or symbol. A date/time is a value that represents a specific date and time. A label is a text string that does not have any special meaning to Excel.
Here are some examples of each data type:
- Number: 123, 456.78, -999
- Character: A, B, C, !, @
- Date/Time: 1/1/2023, 12:00 AM, 9:00 PM
- Label: This is a label.
A label is not a valid data type in Excel because it does not have any numeric or date/time value. A label is simply a text string that can be used to describe or identify data. For example, you could use a label to name a column or row in a worksheet.