I think boundless and bare; those adjectives are ironic
In jail, there is no pure. There is no good, so to say. Light is associated with humanity, peace and happiness. Would one think that jail is meant to be filled with happiness? No. Darkness is an epitome of bad, like a sinner in a church. You wouldn't see a joyful person inside a prison. Instead, it is filled with anger and regret. Miller sets the jail in darkness to create tension, bringing a gloomy mood.
The literary device the author used in the passage is c) irony.
It is quite ironic that the weather forecaster, who is supposed to know about the weather, chose just one day in the year to go camping, and it started raining.
The term CETI stands for Communication of Extraterrestrial Intelligence and this essay is written by Lewis Thomas. Based on this essay, the tone that mostly covers the whole essay is SCIENTIFIC because this focuses about the persuasion regarding his research. The answer would be option C.