中南大学站
黄家湾站
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 中南大学站 and 黄家湾站 (except for this two stops)? 
A) 9 
B) 31 
C) 19 
D) 20 
