Read the following context and choose the best option to answer the question.
Context: Why did n't you care ? After sunset , riding home on our bicycles , I made you stay in the grass . The light - oh , a barely dim force - could not help you then . And the road was a far darker gray than you thought .
Question: Why is the biking abilities of the subject impaired ?
Options: 
A. They only know how to bike on the grass .
B. The narrator is hurting them .
C. It is dark out .
D. They ca n't bike well .


C