This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Coils are incorporated in orthodontic appliances to: 
Select and explain. 
A. Decrease the amount of force, B. Increase the range of movement, C. Increase flexibility, D. Increase the amount of force
B: Increase the range of movement
Answer: B: Increase the range of movement 
Explanation: None