Reader feels instructed. Organizing principle stated clearly, and all points are unified around central idea. Opening draws reader in, and closing relates thematically to opening. Transitions are smoother than the C paper. Sentence structure is varied even though the prose may be a bit flabby and wordy.
Diction is more concise and precise.
Little is included to distract or disturb the reading process. Reading is a pleasure. Surpasses the ordinary paper and is free of serious errors. The subject is very well developed with original and fresh ideas and depth of thought always with an eye to the reader. Reader feels delighted or instructed at every stage of the reading process.