It is incorrect to assume that E is wrong in the first go. Unless you realize you are stuck with B Vs E. Now it boils down to the fact whether M's painting style has bearing on the dates or his habit has bearing on the painting dates. Then the answer is apparent. Even if his painting style changes then does it rules out the fact that he didn't paint between 1507 and 1509. Its 50/50 chances. E is not breaking the argument after negation.
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