I think the 1st one has a problem as the word land doesn't end with lands..
For this reason..
Usually they use this phrase to explain why something had happened in this case it could be referred to the solution
I believe the answer is C. You can brake that sentence into to two sentences and it will flow better.
Hope that helps! :)
E
The answer is E because every website is a source for you research topic.
(When you do a research project make sure to use all the information you have!)
