The main reasons were, America's support the ongoing struggle by Cubans and Filipinos against Spanish rule, and the mysterious explosion of the battleship U.S.S. Maine in Havana Harbor.
I think the answer is a because one of the things you need in a poem is rhythm and I feel like a has the most rhythm. Each different form of poetry has its own requirements—rhyme scheme, number of lines, meter, subject matter, and more but for this one in particular it is rhythm so my choice would be A .
Answer:
They were killed off by diseases the Europeans brought