The answer is the text will be arranged in Sequential order, which is the order of steps. At the end of the first paragraph it talks about how it will talk about the steps of putting on a helmet.
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You are right. the answer is D
The right answer for the question that is being asked and shown above is that: "c. The novels and short stories written by explorers were too difficult to preserve and have been lost." the literature of exploration filled with so many journals, letters, and other nonfiction sources because <span>c. The novels and short stories written by explorers were too difficult to preserve and have been lost.</span>
I would say suit doesn't belong.
All of the other words could be classified as verbs, and suit simply as a noun in almost any case.
