林城西路站
龙洞堡机场站
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 林城西路站 and 龙洞堡机场站 (except for this two stops)? 
A) 21 
B) 4 
C) 1 
D) 28 
