What characteristic defines the stockinette pattern in knitting?

The characteristic that defines the stockinette pattern in knitting is the formation of V shapes created by the stitches. Stockinette stitch is achieved by alternating between a knit stitch on one side and a purl stitch on the other. This process results in a smooth, flat surface on one side, where the V shapes are clearly visible, and a bumpy texture on the reverse side. The distinct appearance of these V shapes is what differentiates stockinette from other knitting patterns.

The other choices do not accurately represent the defining features of stockinette. Interlocking loops typically describe a different type of stitch construction, often seen in techniques such as crochet or certain stitch patterns in knitting. Alternating colors can create a variety of visual effects in knitting, but it is not a characteristic unique to stockinette. Using multiple yarns at once pertains to techniques such as marled or stranded knitting, which does not describe the essential nature of the stockinette stitch.