What year did the Titanic sink?

The sinking of the Titanic occurred in 1912, making this the correct answer. The RMS Titanic struck an iceberg on April 14, 1912, during its maiden voyage from Southampton to New York City. It sank in the early hours of April 15, resulting in a tragic loss of life. This event is one of the most infamous maritime disasters in history, directly impacting maritime safety regulations and public perception regarding the safety of sea travel.

In contrast, the other years mentioned are significant in their own contexts but do not pertain to the Titanic disaster. The year 1905 is before the Titanic was built, which launched in 1911. The years 1915 and 1920 are after the sinking and do not relate to the timeline of the Titanic's voyage or its sinking, making 1912 the only accurate choice for this question.