Read this stanza from the poem "friendship.

friendship needs no studied phrases,
polished face, or winning wiles;
friendship dons no surface smiles.

which theme is best communicated in the stanza from "friendship"?

a. one must be very intelligent to be a true friend.
b. the best way to make friends is to praise people you like.
c. a true friend has a smile to offer, even in the worst of times.
d. true friendship goes much deeper than polite social interactions.