Answer: D. It tells the audience that a battle will occur before the play is over.
Step-by-step explanation: In the given excerpt from act 4.3 of "The Tragedy of Julius Caesar" by William Shakespeare, we can see a conversation between Brutus and Messala, who are discussing the content of some letters they have received. In those letters there is information about Octavius and Mark Antony bending their expedition toward Philippi, which tells the audience that a battle will occur before the play is over.