The verbal exchange that occurred between the two opposing armies in Act 5.1 is short and bitter. Anthony and Octavius were qutie distressed during the exchange which resulted in the two of them leaving the small conference. Brutus and Cassius were left behind to get ready for the battle.
It's either going to be A or B because a C is talking about interviewing one person and D doesn't make sense because what happens if you can't here the radio clearly or it might keep going in and out