by bbirdwell Sat Jul 30, 2011 7:26 pm
I think it's totally a question of emphasis. Notice the commas and discard the qualifiers (dependent clauses) to understand exactly WHAT is being proposed as the main point.
This means that (A) is saying that the main point is: "some scholars persist in claiming that such burning..."
And likewise (C) is saying that the main point is: "evidence of the frequency of the burning is extensive"
(A) is more like the main point of the 1st paragraph. However, (C) better reflects the main point of the entire passage, as the 2nd and 3rd paragraphs present evidence about the burning that counters those scholars in the 1st paragraph.
Therefore we've got to choose (C). Does that make sense?
In a way, it all comes back to fundamentals -- when answers are complex, chop them into small pieces and emphasize the most important aspect.