Final answer:
The student statement that indicates a misunderstanding of preventing dry skin is wearing splints at night.
Step-by-step explanation:
Out of the given statements, the one that indicates a misunderstanding of preventing dry skin is option C: 'I will wear splints at night to prevent scratching in a deep sleep.'
While it is important to prevent scratching to avoid further damage to the skin, wearing splints at night is not a self-care measure for preventing dry skin. Splints are typically used for other purposes such as supporting or immobilizing a joint.
Other options such as decreasing intake of caffeine and alcohol, using deodorant soap instead of alkaline soap, and adjusting the thermostat to maintain a comfortable temperature are all appropriate self-care measures to prevent dry skin.