Which of the following is a sign that ROM exercises should be avoided?

The correct choice indicates a situation where range of motion (ROM) exercises should be avoided due to specific signs of inflammation or infection. When joints are red and hot, it typically suggests that there is increased blood flow to the area, often because of swelling or inflammation, which can occur in cases of arthritis or other joint-related issues. Engaging in ROM exercises when joints exhibit these signs could potentially exacerbate the condition, cause pain, or lead to further injury.

In contrast, other signs such as patient fatigue or enthusiasm might inform how the exercises are approached but do not directly contraindicate the performance of ROM exercises. Normal appearing joints suggest that ROM exercises might be appropriate and beneficial. Therefore, the presence of redness and heat is a critical indication that such exercises should be avoided to protect the patient's wellbeing.