The size of . . . . . . . . is determined by the label’s margin property.

margin lines
label
border lines
label lines

The correct answer is: A. margin lines

The margin lines are the lines that surround the label. The size of the margin lines is determined by the label’s margin property. The margin property is a CSS property that specifies the space between the label and its surrounding elements.

The other options are incorrect because:

  • Option B, label, is the element that is surrounded by the margin lines.
  • Option C, border lines, are the lines that surround the label’s border.
  • Option D, label lines, are the lines that are inside the label.