Translate into idiomatic English: "Imperātor cīvēs hortātur ut castra pōnant."

The phrase "Imperātor cīvēs hortātur ut castra pōnant" translates to "The emperor encourages the citizens to pitch camp." This translation captures the essence of the Latin verbs used, where "hortātur" means "encourages" or "urges," and "pōnant" indicates an action that the citizens are being prompted to undertake.

In this context, "castra" translates to "camp," but more specifically, it refers to establishing or setting up a camp, as suggested by the verb "pōnant," which is related to actions like pitching or putting up a camp. The choice reflects the encouragement rather than any form of compulsion or insistence, which aligns with the original intent of the Latin phrase.

The language indicates a motivational rather than a commanding tone, making option B the most fitting and idiomatic rendering of the original phrase, capturing both the meaning and the nuance implied by "hortātur."