Many food-bourne illnesses start with unwashed hands that prepare food, so the answer is washing your hands
Maybe something like "revenge" depending on the context :)
D. third person voice and present tense verbs.
You use 3rd person because it is more formal. The teacher always says "don't use I!"
You use present tense to talk about the book because even though you as the writer already read the book, the person who is reading your analysis may not have read the book, so use present tense. For example, you should write, "The book states on page" instead of "The book stated on page"
