Which method uses moisture and pressure to create a mold?

The correct answer is the method known as sand casting, which utilizes a mixture of sand, moisture, and pressure to create molds for metal casting. In this process, a pattern of the desired object is typically embedded in a sand mixture that has been moistened to achieve the right consistency. Once the pattern is removed, the cavity left behind forms the mold into which molten metal can be poured. The moisture in the sand helps to bind the sand grains together, while the pressure ensures that the mold retains its shape and has the necessary strength to withstand the pouring of hot metal.

While the other options focus on different artistic processes or techniques, they do not involve the use of moisture and pressure in the same way sand casting does. Knitting is a textile technique involving interlocking loops of yarn, lost wax casting is a method primarily associated with metalworking that revolves around creating a wax model that is then melted away, and appliqué involves sewing or adhering decorative pieces of fabric onto a larger piece. Each of these techniques has its unique properties and applications distinct from the mold-making process of sand casting.