Knitting involves which of the following techniques?

The technique of knitting is fundamentally about looping yarns together to create fabric. This process involves using two needles to interlock strands of yarn in specific patterns, resulting in a flexible and stretchable textile. Each stitch in knitting is made by pulling a loop of yarn through another loop, allowing for various patterns and textures depending on how the loops are arranged and the type of yarn used.

The other options do not relate directly to the knitting process. Attaching layers of fabric pertains more to sewing or quilting techniques, dyeing fabric with wax is associated with batik processes, and creating molds using sand is related to casting and sculptural techniques, which are completely different from fabric construction methods in knitting. Therefore, looping yarns together is the essential characteristic that defines knitting.