Reader is not tempted to read the paper again. Idea stated clearly but with little original thought. Few errors have escaped the writer's attention. 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.