The correct answer is C. .
The text-overline-width property is used to specify the width of an overline. An overline is a line that is drawn above a character or a group of characters. The value of the text-overline-width property can be a length value, such as “1px” or “2em”, or it can be a keyword value, such as “thin” or “medium”.
The keyword values for the text-overline-width property are:
- thin: The overline is thin.
- medium: The overline is medium.
- thick: The overline is thick.
- auto: The overline is the same width as the text.
The value ” ” is not a valid value for the text-overline-width property. This is because the text-overline-width property is a length property, and length properties must have a unit of measurement. For example, the value “1px” is a valid value for the text-overline-width property, because it has a unit of measurement (pixels). The value “2em” is also a valid value for the text-overline-width property, because it has a unit of measurement (ems).
The value ” ” is not a valid value for the text-overline-width property because it does not have a unit of measurement.