Why were the people in early farming communities able to do various kinds of work?

a. the changing climate caused people to adapt.
b. improved farming techniques resulted in food surpluses.
c. people began to domesticate wild animals.
d. people started trading with neighboring communities.

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.