Read this excerpt from Anne Frank Remembered by Miep Gies. I promised that I'd come back and sit and we could have a real talk in the afternoon when I returned with the groceries. But conversation would have to wait until then. I went back to the office and got started with my work.

Elli Vossen and Jo Koophuis were working across from me in the office. Sometime between eleven and twelve o'clock, I looked up. There in the doorway stood a man in civilian clothes. I hadn't heard the door. He was holding a revolver, pointing it at us. He came in. "Stay put," he said in Dutch. "Don't move."

Which tone would be most appropriate for a trailer that includes this scene?

informal
humorous
mysterious
educational