The purpose of Antony's speech was, to let the conspirators know his feelings about his friends death and his plan for revenge.
Speech is referred to as a way of expressing thoughts about something.
Conspirators are referred to as people or individuals who take part in conspiracies.
Revenge is defined as the actions that are done to hurt someone for payback.
Because through this speech, Antony addresses the people of Rome about how Brutus was wrong and how he feels about his friend Caesar's death. In this speech he even talks about how and what he feels about conspirators, and through the speech, Antony tries to persuade the gathered crowd and wants to see and feel about the ordeal. This speech was a way of saying that Antony would take revenge for every wound caused to his friend Caesar, and the tone he used to express his feelings on this was very convincing.
Hence the correct option is, to let the conspirators know his feelings about his friends death and his plan for revenge
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