I do not understand the difference between answer choice C and D. How do you suggest that I decipher between two choices that are so close. I tried to incorporate them into the passage and incorrectly thought that D was a winner.
Ok..I feel there is just no way I could have got this question. It is a most strengthen question and I feel the answer choice weakens the argument. The job is to sure up the fact that a volcanic event is the probable cause rather than meteorites. The ...
I tried to diagram the premise in this question and I get R-->BOC. I picked an Idea "not rational" and negated it and made it the sufficient. But this is quite different from what you give in the video explanation (not BOC -->R) . What am I doing ...