庐山南大道站
珠江路站
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 庐山南大道站 and 珠江路站 (except for this two stops)? 
A) 15 
B) 21 
C) 0 
D) 19 
