The text tells us that in the 1950s it was naively thought that the close reading of the text by an analytical philosopher was sufficient to establish the meaning even if the philosopher had no knowledge of the period of the text's composition (lines 17-21), meaning the historical background was considered irrelevant as (B) suggests if one can establish the meaning without even knowing when the text was written. (E) is incorrect because the text explicitly says that the meaning could be established even by a philosopher who had no knowledge of the period and thus no knowledge of the historical context.