Final answer:
The correct answer is c) "I use a donut-shaped cushion when sitting for long periods."
Step-by-step explanation:
This statement indicates the need for further teaching because using a donut-shaped cushion can actually increase the risk of pressure ulcers. While it may provide some temporary relief, it does not effectively distribute pressure and can put more pressure on the areas surrounding the cushion.
To prevent pressure ulcers, it is important to change positions regularly, keep the skin clean and moisturized, and perform regular exercises to improve circulation.