An underlying cause of world war i was
a. the ongoing dispute over the convoy system.
b. the web of alliances european nations created for their defense.
c. an alliance between the autocratic rulers of germany and russia.
d. american insistence on neutrality.

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.