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.