PT58.S4.Q23 - eight large craters

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In my opinion, this is the hardest question on PT 58. I missed it because I didn't understand what B was saying. Can someone help me translate it/evaluate my translation of B into English? Here is my breakdown for this one:

There are eight craters in a straight line somewhere. Some of these craters have rocks that have undergone high pressure shocks. These shocks could have been caused by meteors or volcanoes. Since the craters are in a straight line, it isn't likely the existence of the craters is due to both meteors and volcanoes. Since the craters are different ages, it must have been volcanoes.

What I am looking for: We need to strengthen the argument. The argument seems to be making an either/or but not both argument. In other words, the craters were caused by either volcanoes or meteors, but not both. The argument is assuming that saying something about the ages of craters is evidence that it was NOT meteors. That's the assumption.

Answer A: This is what I chose, but I really didn't like it. I think this does actually strengthen the conclusion because it provides some evidence that volcanoes can actually create a "similar" line of craters. However, I don't like this answer very much because the line was "shorter" and the craters were the "same age." This doesn't address the assumption that age matters since it controls for that factor. So although this does strengthen the conclusion, it doesn't strengthen the argument.

Answer B: This is the correct answer, but I am having a very tough time translating this into English. This is saying that there is no known natural cause that could account for 8 meteor craters of different ages in a straight line; I probably should have chosen this answer in hindsight since it is the only answer choice that even talks about a relevant case of different aged craters. I think we can assume two things from this answer choice: volcanoes are a natural thing and meteors are a natural thing. Here is my translation:

1.) There is no known volcano that would likely account for the craters being from a meteor. To me this is like a "duh?" statement. Volcanoes and meteors are independent things. Of course volcanoes wouldn't account for the meteor craters.

2.) There is no known meteor that would likely account for the craters being from a meteor. I think this is the reason why this answer strengthens the argument. Does this flat out deny the chance that meteors were the cause? I think at best it only sort of does since the idea of "known" isn't all encompassing. There could be cases that we don't know about. So, in my mind, at best this is a pretty weak strengthener. It depends heavily on the idea that what is "known" is actually a reliable thing to use as evidence in this inductive argument.

Answer C: I think this severely weakens the argument since it suggests that it was neither meteors nor volcanoes. Definitely don't want this one.

Answer This is similar to C. This weakens the argument since this suggests that volcanoes were not the cause.

Answer E: This is another trap answer choice that I had a tough time eliminating during the timed exam. I think this answer is very similar to A in that it does strengthen the conclusion, but not the argument. This answer choice suggests that a single meteor shower couldn't have created the craters. However, what about meteors from different showers at different times? Being from the same meteor shower implies that the craters that would have been potentially created would be roughly the same age, which wouldn't create an analogous situation to begin with.
http://7sage.com/lsat_explanations/lsat-58-section-4-question-23/