The answer is 'glossary'. It is usually found at the end of the book and is a list of the technical terms used throughout the book.
I'm not really good in revision. But I can definitely tell you there are plenty of tips on revision available online. Try to check these https://depts.washington.edu/owrc/Handouts/Revising%20Your%20Paper.pdf Personally, I use the help of Supreme essay service. Those guys always help me both with proofreading and editing, So if you want you can give them a try. Best of luck!
A or D I think, but I really think it's A.
Think about what a claim is. a claim is something that you state, even if you don't have proof. choice C is a fact, not a claim--it would be used as evidence to support a claim, but it doesn't serve as a claim itself.
i would say that B is the most appropriate claim to argue that people should be more nutritionally knowledgeable. choice D is almost a counterargument, in a sense, because it lists a flaw with food labels. choice A is a statement, but it can be proven with evidence--one could look at a food label to search for the listed items.