红会医院北区站
纬一街站
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 红会医院北区站 and 纬一街站 (except for this two stops)? 
A) 15 
B) 20 
C) 4 
D) 6 
