Read these lines from the poem. (A Poison Tree)
I was angry with my friend: I told my wrath, my wrath did end.

How do these lines refine the theme of the poem?
a. They imply that anger towards a friend is less intense than anger toward a foe.
b. They imply that expressing feelings of anger leads to negative consequences.
c. They imply that expressing negative feelings causes those feelings to disappear.
d. They imply that anger will fade and eventually disappear if it is ignored.