Which one the following best states the author's main conclusion? A. Because P. D. James's potential as a writer is stifled by her chosen genre, she should turn her talents toward writing mainstream novels. B. Because the requirements of the popular novel are incompatible with true creative expression, P. D. James's promise as a serious author has been diminished. C. The dichotomy between popular and sophisticated literature is well illustrated in the crime novels of P. D. James. D. The critics who have condemned P. D. James's lack of attention to the specifics of detection fail to take into account her carefully constructed plots. E. Although her plots are not always neatly resolved, the beauty of her descriptive passages justifies P. D. James's decision to write in the crime-novel genre.