Concept:Apostrophe occurs when a speaker directly addresses an absent person, an abstract idea, or an inanimate object as though it can listen and respond.
Explanation:In the given line, "Nightfall!" is repeated with an exclamation and is followed by the pronoun "You."
This shows that the speaker is not merely mentioning Nightfall, but is actually calling out to it in direct address.
Nightfall is an abstract period of time that cannot hear or reply, yet the speaker treats it as a living enemy.
This emotional, direct address of a non-human or absent subject is the defining feature of apostrophe.
It is not an allusion because there is no indirect reference to another text, person, or event.
It is not a metaphor because Nightfall is not being compared to something else.
It is not an ode because an ode is a long, formal lyric poem of praise, not a single line of direct address.
Answer:D. apostrophe