Final answer:
The incident that brought America to war with Spain was the mysterious blowing up of the USS Maine.
Step-by-step explanation:
The incident that was considered more serious to bring America to war with Spain was Option C: the Maine was mysteriously blown up. The USS Maine, an American battleship, exploded in Havana Harbor in 1898. While the exact cause of the explosion remains uncertain, the incident was blamed on Spain by American newspapers and politicians. This event played a significant role in triggering the Spanish-American War.
Learn more about the cause of the Spanish-American War