南宁剧场站
苏卢站
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 南宁剧场站 and 苏卢站 (except for this two stops)? 
A) 5 
B) 12 
C) 15 
D) 21 
