The element of design which can be used to create emphasis or de-emphasis on a garment is line.
The emphasis in elements of design is where the part of the design which tends to catche the viewer's attention. So, usually the artist will make one area stand out by contrasting it with other areas. Thus, the area could be different in color, size, texture, shape, etc.
Here, lines can be used to emphasize, setting particular information which is off in a busy composition and as well as drawing the eye to a particular area. Thus, they can be formed into shapes or frames.
Hence, option C is correct.
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