The correct answer is D. A Shakespearean soliloquy
Explanation
Brave New World is a novel by Aldous Huxley published in 1932. It is a story that takes place in a fictional futuristic society. One of the most interesting aspects of this novel is the title that originated based on Act V of The Tempest a by William Shakespeare. In this act, Miranda who is one of the characteres is given a soliloquy and recites the following sentence in her speech
"How beauteous mankind is! O brave new world"
From there, Aldous Huxley extracted the name of his masterpiece. According to the above, the correct answer is D. A shakespearean soliloquy.
