the best element is the one which is the intresting ones ... Why is B ...
You may have to put some effort in here. There's these things called books you see, and within them one may find information. The amazing thing is that there are books about all sorts of things these days. History, philosophy, mathematics, and even chemistry - and even as specific as "Chemistry of the elements" by Greenwood and Earnshaw". You name it, theres probably a book about it! But it gets even better, theres these places where they have loads of them, and I mean loads - shelves and shelves of books! You can pay them a bit of money and they let you borrow the books for a bit - it's so cool! It's called a library. It's really handy because that way you don't have to buy them all - books can be pretty expensive if you buy them to keep.
Oh, also there's this wicked new thing called "the Internet"! It's soooooooo awesome. Seriously! In fact, you are using the Internet right now! Cool isn't it! There's so much stuff on the Internet - it is truly amazing. Now, only problem is finding what you're looking for. Well, fear not because someone came up with these things called "search engines". One of them is called google, and can be found at www.google.com
if you tell google what you're looking for, it has a look around and then shows you web pages that it thinks have what you want! You hardly have to do anything, it's really, really easy! Even a child could do it!
I strongly believe that with the combined power if books and the Internet, we are unstoppable. Good luck my friend, and godspeed.