The best answer would be, "C". The listeners could repeat what you're saying, but they might not understand what you are saying. Listening is not understanding. If you say each idea in three different ways, you could confuse the listeners.
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Why would everyone be concerned about Anne's nightmare?
D. Because they do not want to be discovered.
The reaction the others have is to silence Anne because her screams “are endangering all our lives”, as Dussel comments. Mr. Frank as well was alerted by the sound and tries to calm down Anne, he wants her to “lie quietly”.