Final answer:
Nick Carraway from The Great Gatsby is a gregarious young man from the Midwest who moves to the East in search of adventure, aligning with option A.
Step-by-step explanation:
The character Nick Carraway from The Great Gatsby by F. Scott Fitzgerald is best described by option A: A gregarious young man from the Midwest, who moves East in search of adventure. This description aligns with Fitzgerald's portrayal of Nick as someone who, while originally from the Midwest, ventures to the East Coast to pursue a career in the bond business. Contrary to the other options, Nick is neither from 'old money' wealth nor a part of the 'new money' elite, and he does not come from a prominent New York family.