Final answer:
The outcome of the War of 1812 was the writing of "The Star-Spangled Banner" by Francis Scott Key.
Step-by-step explanation:
The outcome of the War of 1812 that led to the writing of a famous work was C) "The Star-Spangled Banner". The poem was written by Francis Scott Key after witnessing the British bombardment of Baltimore's Fort McHenry in 1814. Inspired by the sight of the American flag still waving after the attack, Key's poem was later set to music and became the United States national anthem.