兴桂路站
安吉客运站
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 兴桂路站 and 安吉客运站 (except for this two stops)? 
A) 10 
B) 21 
C) 20 
D) 4 
