It gives a comparison of before and after...before they were motionless cast iron tethered to rusted poles, they frolicked to organ music. Cause/effect. maybe
I'm not sure but I think it's B
The best answer is that a linear array helps someone organize synonyms or antonyms by letting him/her organize words according to nuance of meaning. Nuance of meaning by definition is a slight difference in meaning.
Hope my answer has come to your help.
