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
The arch length preservation can be best carried out by: 
Select and explain. 
A. Placing a lingual arch, B. Restoring carious teeth, C. Placing band and loop space maintainer, D. Placing an acrylic removable space maintainer
B: Restoring carious teeth
Answer: B: Restoring carious teeth 
Explanation: None