Final answer:
The make up sign is not made of linen, as linen is a fabric and the make up sign is generally not a fabric-based item but an object that indicates information about makeup.
Step-by-step explanation:
The question asks to identify which item is not made of linen. Given the options, A. Face towel, B. Make up sign, C. Flat sheet, and D. Bed cover, three of these items are commonly made of linen, which is a fabric derived from the fibers of the flax plant. However, make up sign is not a linen product as it is not a fabric but rather an object or a display item that typically does not involve fabric materials, particularly not linen. Linen is known for its strong and absorbent qualities and is frequently used for household textile items such as towels, bedsheets, and tablecloths.