一大会址·黄陂南路站
定边路站
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 一大会址·黄陂南路站 and 定边路站 (except for this two stops)? 
A) 9 
B) 21 
C) 3 
D) 24 
