Which casket interior style is created using a multiple needle head sewing process that draws the material in parallel fashion?

The shirred interior style is characterized by its unique sewing technique involving a multiple needle head process. This method gathers the fabric in parallel lines, resulting in a series of soft, pleated folds that create a visually appealing texture. The parallel stitching adds a refined and neat appearance to the casket interior, contributing to an overall sense of elegance while also enhancing the depth and softness of the fabric used. This technique is particularly popular for its aesthetic qualities, making it a favored choice in many casket designs.

In contrast, tufted interiors involve a different method where buttons or knots are used to create dimples or indentations, making for a more distinct pattern. Piped interiors utilize a corded edge around the fabric, which provides a framed look but doesn't incorporate the gathered effect of shirring. Gathered interiors, while they may also involve folding fabric, do not specifically employ the same multiple needle head technique that characterizes shirring. Thus, the distinctive sewing process associated with shirring is what makes it the correct answer.