What should be placed under the resident's head for support?

A pillow is the most appropriate item to place under the resident's head for support. Pillows are specifically designed to provide optimal support and alignment for the head and neck. They can help maintain spinal alignment and ensure that the resident is comfortable, which is essential in preventing strain or discomfort during rest or sleep.

The use of a pillow is standard practice in nursing care, as it can effectively absorb pressure and contour to the individual's head and neck shape, aiding relaxation. This helps in preventing potential issues associated with improper positioning, such as pressure ulcers or musculoskeletal discomfort. Other options, while they may provide some level of support, are not ideal as they do not offer the same level of comfort or structural support as a pillow. For instance, a soft blanket may not provide sufficient elevation or firmness, and a rolled towel may not have the proper surface area for stability, while a cushion from a wheelchair may not be designed for head support and could introduce risk factors related to hygiene and repositioning.