后不塔气站
附属医院站
Please solve the multiple choice problem and put your answer (one of ABCD) in one "\boxed{}". According to the subway map, how many intermediate stops are there between 后不塔气站 and 附属医院站 (except for this two stops)? 
A) 16 
B) 3 
C) 15 
D) 9 
