Thank you for the explanation! I was trying to understand the argument in its abstract form, but I often found myself neglect important information and end up choosing the wrong answers. Is there any particular thing I should pay attention to during abstraction? Any advice on how to tackle those ana...

Thanks for the explanation! I am confused by choice C as well. My thought process of choosing C is that inline 50-52, it says that PCB poisoning is known to impair the functioning of the immune system and liver. Then the author presents an alternative hypothesis to account for "these facts"...

Thanks for the explanation. I think A is also wrong for another reasoning. if we negate this choice, won't it be "the scientists reviewing serious scientific papers for publication do not SOMETIMES have biases likely to slant their interpretations of data"?. It does not destroy or seriousl...