What term least describes the mood of this passage from The Jungle by Upton Sinclair Jr tonight in Chicago there are a hundred thousand children A chagrin B sullen C dauntless D despondent?

The full question and reading passage is:

Tonight in Chicago there are a hundred thousand children wearing out their strength and blasting their lives in the effort to earn their bread! There are a hundred thousand mothers who are living in misery and squalor, struggling to earn enough to feed their little ones! There are a hundred thousand old people, cast off and helpless, waiting for death to take them from their torments! There are a million people, men and women and children, who share the curse of the wage-slave; who toil every hour they can stand and see, for just enough to keep them alive; who are condemned till the end of their days to monotony and weariness, to hunger and misery, to heat and cold, to dirt and disease, to ignorance and drunkenness and vice!

The term that least describes the mood of this passage is dauntless.