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
Which terminal plane is favorable for E/E to have class I molar relationship? 
Select and explain. 
A. Flush terminal plane, B. Mesial step, C. Distal step, D. None of the above
B: Mesial step
Answer: B: Mesial step 
Explanation: None