红旗西路站
马栏广场站
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 红旗西路站 and 马栏广场站 (except for this two stops)? 
A) 23 
B) 18 
C) 19 
D) 1 
