In the passage, the author is primarily concerned with A. Pointing out the superiority of one painting style over another. B. Citing evidence that requires a reevaluation of a conventionally held view. C. Discussing factors that explain a difference in painting styles. D. Outlining the strengths and weaknesses of two opposing views regarding the evolution of a painting style. E. Arguing for the irrelevance of one theory and for its replacement by a more plausible alternative.