Has the rudiments of an argument but contains some basic problems. It may focus on a thesis which does not lend itself to debate or is too broad to be covered in a short paper. It may make an interesting argument that is difficult to follow because of organization or language which veers out of control. Some specific grammar problems such as comma splices, sentence fragments, consistently poor word choice, or spelling problems will tend to put a paper in the C range. A judicious choice of topic which is original, thoughtful, and manageably defined.
Organization is sound, and there are no major weaknesses in the argument.
Sources and evidence from outside resources are well chosen, judged, and integrated. Essay may be less stylistically effective than the A essay or contain a few rough spots. It explores its assumptions carefully and perhaps ruthlessly, and it integrates evidence and analysis well. Is well-organized, and builds on its argument throughout. Almost entirely free of awkward or inappropriate language, and demonstrates rhetorical flare.