June 1991 LSAT - Section 1 - Question 4
Emil-Kunkin February 6, 2024
From the context, it seems the author is indeed using closed system to say that poetry of the time was not willing to adopt new innovations in the way that people actually spoke. Given the sentence following the line in question, it seems the author is more concerned with stylistic and linguistic conventions of poetry rather than subject matter. I would thus look for an answer choice that reflects the idea that closed system means poetry was not open to new ways of speaking.