Which of the following sentences is most clearly describing a theme? A.The mountains rose like the steeples of a Gothic cathedral. B.The golden feather represents Mrs. Whitherby's soul. C.One can fit over a million Earths inside the sun. D.Historical context may change, but human nature stays the same.

The word "theme" is mainly a term used in literature including novels, and poems to refer to the main underlying idea or message the author of a literary work wants the audience to understand. Additionally, most themes refer to a specific belief about some aspect of human life (love, death, good vs. evil, war) by expressing the way some features human nature are or should be. Additionally, themes can be stated explicitly or developed through other elements such as the characters' actions or values. Considering the previous ideas, the sentence that most clearly describes a theme is "Historical context may change, but human nature stays the same" because this sentence states a message related to some aspect of human life, in this case, is the human nature in different historical context, additionally, this statement is based on a belief the author wants the audience to understand which is the main purpose of the theme.