It identifies the focus and method of the research project.
AND
it provides important scientific and medical data to the public.
I don't know this for sure but if an author has something to declare and they can't back it up it's just an idea. So if you want to identify the claim you have to have statistics and facts to prove what you're saying. But remember I am not am expert so whatever you think the answer is go with it. Hope this helps ;)
I wouldn't count on my answer for your life but I'm pretty sure that it's C sorry if I couldn't help
It can always make you learn new things
Answer: Pistols and revolvers
Explanation: (Dont ask how I know that (;)