According to the passage, in the absence of definite knowledge concerning the dates of composition of ancient literary works, literary historians do which of the following when trying to establish the chronology of an author's work? A. Make assumptions about a single work's date of composition if such assumptions would not seriously affect interpretations of other works by the same author. B. Draw inferences concerning the date of a work's composition based on evidence internal to that work and on the author's other works. C. Ignore the date of a work's composition which is supplied by archaeological research when literary factors internal to the work contradict that date. D. Refrain from speculation concerning a work's date of composition unless archaeological finds produce information concerning it. E. Estimate the date of a work's composition without attempting to relate it to the author's development as an artist.