Word choices are workable and clear, though verbs may lack bite or strength. A 'C' paper is characterized by awkwardness throughout. It does not read smoothly aloud. Information tends to be adequate, but barely sufficient for clarity. Organization is occasionally confused, especially between sentences.
Sentences have little or no structural variety.
Unnecessary words and phrases make the writing loose. There are several grammar, spelling, and punctuation errors. In a 'D' paper the main impression is one of haste, carelessness, lack of attention, or simply an inability to draft even direct or simple statements. The paper may make some sense, but only if the reader struggles to find it. The writer obviously has scanty control of the material.