Which of these events triggered the spanish-american war?

a-exposure of a spaniard's letter about president mckinley
b -the explosion of the american battleship the maine
c-the harsh treatment of cubans by general weyler
d-capturing of the san juan hill by the rough riders

Which stanza structure does emily dickinson use in this excerpt from "hope is the thing with feathers"? hope is the thing with feathers that perches in the soul, and sings the tune without the words, and never stops at all, and sweetest in the gale is heard, and sore must be the storm that could abash the little bird that kept so many warm.