I forgot to top - up my card ! " And with no small change with us , we were forced to walk from the apartment beside Greenview Sec all the way to Pasir Ris MRT station . I could have taken the bus , but being a good person that i am , i walked with my sister .
Why may the narrator 's legs be so sore and tired ?
Pick the best answer from the following options:
A. They took a car .
B. They opted to walk .
C. They took a boat .
D. They took a train .


B