The United States intervened in Cuba actually in 1898 for gaining independence from Spain Option(a) is correct.
Why United States intervened Cuba?
United States intervened Cuba because of some rebel success in Cuba at the period of the second world war in the period 1897 in US it was that time when the president of William offered $300 million for buying Cuba.
Actually US intervened in Cuba from Spain at that time in February 15, 1898 which led to the declaration of the war against Spain in the period of next two months accordingly.
Therefore Option(a) is correct.
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