C. Naturalists assume people cannot choose their fate and, instead, are influenced by psychological and social forces.
Explanation:
Naturalism is an artistic and literary movement known to be the radicalization of realism, based on the faithful observation of reality and experience, showing that the individual is determined by environment and heredity.
General features of Naturalism are
Impersonality / Simple and lean language
Literary engagement (the author tries to convince the reader)
Determinism (man is the fruit of the medium / race / moment)
This is an instance of dramatic irony, taking into account that this figure of spech is when the implications of a situation, speech, etc, are understood by the audience but not by the characters in the play.