Answer:
The correct answer to fill the blank space of the question: The _____ of a poem contain context clues that let the reader know what the poem is about, would be, A: Supporting details.
Step-by-step explanation:
The reason is that supporting details, unlike any of the other answer choices offered, are the ones that clue in a reader onto the main ideas, and even the themes, that a poem is dealing with. These supporting details are like guidelines, or hints, that start helping the reader to connect the dots on what the poet is writing about, what he wants to convey. This is why the answer is A.