Which part lines the rim and surrounds the cap panel of a casket interior?

The correct answer is that the cove lines the rim and surrounds the cap panel of a casket interior. The cove serves both a functional and aesthetic purpose by providing a finished look to the interior of the casket. It acts as a continuation of the interior fabric and helps to smooth the transition from the top of the casket to the sides, enhancing the overall appearance.

The cap liner, in contrast, covers the entire interior areas of the cap and is distinct from the cove, which specifically addresses the rim area. Lining bumper refers to additional padding that may be placed elsewhere inside a casket, and pillow padding is specifically associated with the cushioning of the pillow itself, not the area surrounding the cap panel. Thus, in the context of casket design, the role of the cove is clear and defined, leading to its identification as the correct answer.