Read the following context and choose the best option to answer the question.
Context: One of them said they were not from around there and had no idea . We could identify with that . I decided to turn back and try and head in the direction of the highway because I knew it went back to Ambleside . By this time , the sun had disappeared behind the mountain and I was starting to have visions of bedding down under some rock for the night while our eighteen college students wondered what in the world could have become of us .
Question: Why is the narrator looking for a rock ?
Options: 
A. None of the above choices .
B. They need to crush it up .
C. They need to hide from the students .
D. They need cover .


D