The answer is "My Last Duchess" because it was written by Robert Browning, not Henry Wadsworth Longfellow. Longfellow is known for poems such as "The Song of Hiawatha" and "Paul Revere's Ride", while Browning's notable works include "My Last Duchess" and "The Pied Piper of Hamelin".
Longfellow's Legacy: Delve into the Illustrious World of Henry Wadsworth Longfellow