丙子铺站
合工大南区站
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 丙子铺站 and 合工大南区站 (except for this two stops)? 
A) 23 
B) 5 
C) 20 
D) 15 
