Read the excerpt from "The Gift of the Magi" by O. Henry. Which sentence uses an auxiliary verb to express certainty?

What is the most important point that the authors make in this paragraph? most enslaved people worked under fair to good conditions. enslaved workers had decent lives if they had fair overseers. plantations often were harsh because of the cruelty of those in charge. men with absolute power can lose the sense of what it means to be good.