The correct answer is B. Soliloquy.
A soliloquy is a speech in a play in which a character speaks to himself or herself, alone on stage. It is a way for the character to reveal their thoughts and feelings to the audience, without the other characters being aware of what they are saying.
A sinecure is a position that requires little or no work, but pays a high salary. It is often used to describe a job that is given to someone as a reward for political favors, rather than for their qualifications.
A pessimist is someone who believes that the worst will always happen. They tend to see the negative side of things and expect things to go wrong.
A philanthropist is someone who donates money or time to help others. They are often motivated by a desire to make the world a better place.