The way that this question is worded. I say the answer is True, given the fact that it might be a single owner websites and not multiple.
I believe that it is B, because the term vivisection isn't commonly used amongst society, or what we consider is the "normal" type of topic to talk about. The answer be clarifies what exactly the type of testing is, which is medical.
C. The mediator is the answer because even though the question is trying to gauge whether you know the meaning of the word mediator, it is also providing a grammatical solution to itself. None of the other words fit in that sentence correctly except for mediator, and also the word mediator (someone who is keeping peace between differing parties) fits the actions the sentence is proposing.
