In language, an antonym refers to a word that opposes in meaning to another word, for example, the word short acts as an antonym of the word tall or the word small acts an antonym to the word big. In the case of the word "objective" this word is used to purposes of goals as a noun as an adjective it describes ideas or elements that are based on facts rather than on feelings or prejudices and therefore, the word that is an antonym of this word is "biased" because this means based on personal judgments, feelings and prejudices which means "Biased" means the opposite or is an antonym of "objective".
Answer: Cite strong and thorough textual evidence to support analysis of what the text says explicitly as well as inferences drawn from the text. ... Determine a theme or central idea of a text and analyze in detail its development over the course of ... Determine the meaning of words and phrases as they are used in the text
Courage is a virtue seems like the answer, but I haven’t read the book. Though, I’m making an education guess because it takes courage to go to the moon.