Read the following sentences. The news report was exciting. A flash mob in costumes had ridden bicycles through town. Which of the following correctly combines these two sentences into a complex sentence? A. The news report was exciting; a flash mob in costumes had ridden bicycles through town. B. The news report was exciting, for a flash mob in costumes had ridden bicycles through town. C. The news report was exciting because a flash mob in costumes had ridden bicycles through town. D. The news report was exciting, a flash mob in costumes had ridden bicycles through town.