The speaker may discuss his anger with his friend but not his foe because it is easier to talk to a friend than a foe.
The poem "A Poison Tree" by William Blake revolves around the theme of anger and how the speaker deals with it. He presents a case of anger with two different people, a foe and a friend and how he resolves them.
The different cases of discussing his "wrath" with his friend but not with his foe may have to do with something like being comfortable with the former while a foe may not have the same attitude as a friend. Moreover, talking to a friend is much more easier than trying to have a conversation with an enemy. Thus, the correct answer is option A.
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