The harpy is the mythological creature that tortures those who are guilty of suicide.
In Greek mythology and Roman mythology, a harpy is known as a half-human and half-bird personification of storm winds, in Homeric poems. Harpies were considered agents of punishment. Therefore, they abducted people and tortured them on their way to hades´ domain, employed by the God as instruments for the punishment of the guilty.
D) a local news station's statistics on vehicle collisions involving teen drivers
The question asks about reliable information. A teenager's blog and a parent forum both contain personal opinions and therefore would not be considered reliable sources for information about the driving tendencies of teenage drivers. A streamed video of a lesson on driving safety may have specific information that would be considered reliable but it is more of an instruction manual on what to do. The best reliable source would be statistics on vehicle collisions involving teen drivers.
Uhm... life? or was that the kinda answer you wanted ><?
A thesis statement is generally the first few sentences of your writing to help get your readers interested in what they'll be reading. So, if your thesis is unclear, they'll be confused about what's going on before anything even happens.
Present evidence that supports the original claim.