合工大南区站
紫庐站
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 合工大南区站 and 紫庐站 (except for this two stops)? 
A) 18 
B) 23 
C) 16 
D) 9 
