"Read the epigraph quoting the New York Times. What is the writer's explanation for why Chris stayed at the bus for three months?"

From the text:

The diary indicates that the man, believed to be an American in his late 20’s or early 30’s, might have been injured in a fall and that he was then stranded at the camp for more than three months. It tells how he tried to save himself by hunting game and eating wild plants while nonetheless getting weaker.