Final answer:
The RMS Lusitania, a British passenger ship, sank in 1915 with approximately 1,000 casualties including 128 American citizens.
Step-by-step explanation:
The correct answer is C) RMS Lusitania.
On May 7, 1915, the RMS Lusitania, a British passenger ship, was torpedoed off the coast of Ireland by a German U-boat. The ship sank in just under 18 minutes, resulting in approximately 1,000 casualties. Among the victims, around 128 were American citizens. The sinking of the Lusitania enraged the American public and heightened tensions between the United States and Germany during World War I.