The thing which the passage foreshadows is B. Doodle’s eventual death
This refers to the literary element that makes use of predictions, prophecy, and hints to give clues about what would happen in the future in a story.
Hence, we can see that from the given narration, there is a description of Doodle and how he learned to walk well and the use of words like "his mahogany coffin" shows that he would eventually die.
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