The answer would be a. spoken and written language because without a solid understanding of this it would be hard to verbally communicate, thus making this the best choice out of the four.
<span>Nonfiction books are based in fact and can take many forms. Some types of nonfiction books are personal accounts, such as journals, autobiographies and memoirs, while others are more instructional, such as how-to books, manuals and reference guides. [ Scientific, religious and philosophical books are typically classified as nonfiction. Medical books, travelogues and essays are also nonfiction</span>
