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: Surgery
Skin graft vestibuloplasty prevent relapse by: 
Select and explain. 
A. Forming a barrier to reattachment of muscle to periosteum, B. Promoting osteogenesis to establish a bone barrier to loss of sulcus depth, C. Causing an inhibitory effect on fibroblasts in the underlying tissue, D. None of the above
A: Forming a barrier to reattachment of muscle to periosteum
Answer: A: Forming a barrier to reattachment of muscle to periosteum 
Explanation: None