4. like a boil that can never be cured as long as it is covered up but must be opened with all its pus-flowing ugliness what is the tone and mood and explain : )

I think I remember someone doing the same question like you, and I bet it has options. 

(saw this online)
"Like a boil that can never be cured as long as it is covered up but must be opened with all its pus-flowing ugliness to the natural medicines of air and light, injustice must likewise be exposed" communicates a(n) tone.

In my opinion it'll be B. or D. 
(( B. matter or D. scientific )) since they both should have a purpose to your question.