The answer to Part A is Gray is killed when a tree from their shelter falls on top of him.
The evidence from the story that best supports this answer is “The great hemlock bough lay across Gray’s chest, cleaved from the tree.”
This sentence directly states that Gray was killed by a falling tree. The other answer choices are not supported by the evidence in the story.
Gray is killed when a hemlock tree falls on top of him. This is stated directly in the sentence "The great hemlock bough lay across Gray's chest, cleaved from the tree." The other answer choices, such as "He steps on a bomb buried in the ground by the soldiers" and "He is caught by soldiers while stealing meat from their camp," are not supported by the evidence in the story.