What makes this excerpt from Act III of Julius Cesar an example of a monologue?

Brutus: (In a kind and honest voice) Romans, country­men and lovers, be silent, that you may hear. Be­lieve me for mine honor. If any dear friend of Caesar's demand why Brutus rose against Caesar, this is my not that I loved Caesar less, but that I loved Rome more. (The citizens murmur with surprise.)

As Caesar loved me, I weep for him. As he was for­tunate, rejoice at it. As he was valiant, I honor him. But as he was ambitious, I slew him. (The crowd nods approval.) There is tears for his love, joy for his fortune, honor for his valor, and death for his ambition. (A few cheer.) I have the same dagger for myself, when it shall please my country to need my death! (All cheer loudly.)

Choose one

A. Brutus discusses with citizens his reasons for killing Caesar.

B. Brutus expresses his regrets to his wife.

C. Brutus reflects on events to himself silently.

D. Brutus shares thoughts and feelings about Caesar with the audience.