The correct answer is: D. column-width
The column-width property defines the width of each column in a multicolumn text flow. It can be used to specify the width of each column individually, or to specify a minimum or maximum width for all columns.
The width property defines the width of an element, but it does not apply to multicolumn text flows. The columns property defines the number of columns in a multicolumn text flow, but it does not define the width of each column. The filter property is used to filter elements in a document, and it does not apply to multicolumn text flows.
Here is an example of how to use the column-width property:
css
.multi-column {
column-count: 2;
column-width: 200px;
}
This CSS code will create a multicolumn text flow with two columns, each of which is 200px wide.