Which sentence uses the subjunctive mood to express necessity? A It was essential that they be active to maintain a sense of self-worth and dignity. B This develops the theme that humans are resilient and able to find many ways to challens C He explains how he and other Jewish people maintained their poise, hope, and sense of s conditions of life in a ghetto.

Absolutely! The subjunctive mood often pops up when we want to express wishes, demands, or necessities. In sentence A, "It was essential that they be active to maintain a sense of self-worth and dignity," you can see this clearly: "be" indicates a necessity for their activity. As for more context, the subjunctive mood is rooted in the idea of what could be rather than what is. Historical literature often used it to drive home imperative themes. You might encounter it in classical texts or when discussing laws and formal statements in legal contexts.