The answer to this question will be a
The best transition to add at the beginning of the third sentence is the following:
C. In addition.
Considering that the sentence introduces information that follows and agrees with the previous sentence, ‘in addition’ is the best transition as it specifies that the sentence will add more reasons for volunteering.
<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>