An over generalization is made about teenagers; just because someone is one doesn't mean that they're a liar
Question 2)
C is the only sentence that is gramatically correct ( A) you can't say most finest, B) more finest doesn't make sense, D) the finer isn't a comparison)
Question 3)
An anonymous website isn't credible, neither is an opinion from your friend, and an article from Tokyo is too small of a region.
When the Second World War ended, France was decimated. ... But an enormous vacuum had been left in the free world by the end of World War II, and the Soviet Union was determined to move into that vacuum. Now, that was the basis of the Marshall plan when we were thinking about reviving Europe.