Question

How do the poetic devices used in this stanza enhance its meaning?

Laugh and the world laughs with you,
Weep, and you weep alone;
The good old earth must borrow its mirth,
But has trouble enough of its own
(from "Solitude" by Ella Wheeler Wilcox)

a They emphasize the selfish nature of human beings.
b They exaggerate the troubles of the world.
c They imply that everyone must struggle on their own.
d They explain that everyone struggles to be happy.