C.
The reason why is because it's talking about how much would it takes to make charcoal, which is a lot to yield so little charcoal. So, it's negative.
The definition of sloth would be laziness, unwillingness to work or act.
Two context clues are the word "idleness" and the phrase "doing of nothing". Idleness may mean boredom, but also dullness. Doing of nothing clearly supports the notion of not working, not acting.
I want to say that 1.) is C and 2.) is A I think and 3.) to be D
Good luck hope I don't srew u up and hope there right let me know if there not and what's the name of this story and have a good nite and hope u enjoy the rest of ur weekend