Smooth is a property. A smooth material is not rough or bumpy.
Look at each picture, one at a time. Imagine touching the material shown in each picture.
Of the choices, the linen handkerchief is the smoothest. If you touch linen fabric, it will not feel rough.
remember
Every object is made of one or more materials. A material is a type of matter. Wood, glass, metal, and plastic are common materials. A material has different properties. A material's properties tell you how it looks, feels, tastes, or smells.
