The correct answer is: C. column-rule
The column-rule property defines the style, width, and color of the rule divider between columns in a multicolumn text flow.
The column property defines the number of columns in a multicolumn text flow.
The column-change property defines the width of the gutter between columns in a multicolumn text flow.
The column-check property is not a valid CSS property.
Here is an example of how to use the column-rule property:
css
.multi-column {
columns: 2;
column-rule: 1px solid black;
}
This code will create a multicolumn text flow with two columns, and a 1px solid black rule between the columns.