Respuesta :
The correct answer is: C. The working class
In the excerpt Eugene Debs states that he identifies with lower class and with the criminal element. Usually those elements (poverty and criminality) are related with the working class in 1918. On those times the working class worked mostly in the factories and had only the essential things to survive, sometimes not even that. When hunger striked their only chance to survive was to commit a crime, therefore most of criminals at that time belonged to lower class.
He clearly says lower class, so options A and D are incorrect as you can't belong to more than one class. Option B is incorrect because "prisoners" is not even a social class, they belong to one of the classes mentioned in the options.