Final answer:
Emotional stress has a significant impact on arthritis symptoms.
Step-by-step explanation:
The most appropriate reason would be option A) Emotional stress has a significant impact on arthritis symptoms. While stress does not directly cause arthritis, it can worsen the symptoms of arthritis, including pain, swelling, and joint stiffness. Emotional stress can activate inflammatory responses in the body, leading to increased inflammation and worsening of arthritis symptoms. Therefore, managing stress levels through relaxation techniques, therapy, and stress-reducing activities can help improve the client's arthritis symptoms.