The best evidence that the speaker's wrath has severe consequences is the fact that his foe has apparently been killed at the end (D).
We are told in the poem, through the garden metaphor, that the speaker lured his enemy close enough (thanks to "an apple bright") to destroy him (I see / My foe outstretched beneath the tree"). What we can guess from this extended metaphor is that:
the fruit was likely poisoned, this is why the foe is lying lifeless at the foot of the tree;
the act of attracting the foe with a shiny, treacherous object is probably an imagery describing the way the speaker pretended to be nice with his enemy to the point of making him believe he was his friend, until he was close enough to kill him.
