Based on historical context regarding the Spanish-American War, the three statements that are true are:
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President McKinley ordered the battleship U.S.S. Maine to Havana Harbor in January of 1898 to protect U.S. interests there. On February 15th, an explosion sank the ship and three-quarters of the ship’s 354 crew members died.
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"Remember the Maine" became a rally cry that encouraged people to support the war.
The statement regarding Americans adopting an imperialistic approach only in Europe is false. The U.S. pursued imperialism not just in Europe but in other regions, including Latin America and the Pacific.
Therefore, the true statements are the first two provided above.