The passage suggests that one of the "assumptions of the 1950s" regarding the meaning of a political text was that this meaning A. could be established using an approach similar to that used by literary historians B. could be definitively established without reference to the text's historical background C. could be closely read in several different ways depending on one's philosophic approach D. was constrained by certain linguistic preconceptions held by the text's author E. could be expressed most clearly by an analytic philosopher who had studied its historical context