Which statement explains the ending of the sonnet?

the last line shows that the poem is lighthearted.
the last line reveals the meaning of all the symbols throughout.
the last line is even more violent than the beginning.
the last line repeats an earlier idea presenting full closure.

on donne’s “holy sonnet xiv: batter my heart”

I would say that the statement that explains the ending of the sonnet is the last line is even more violent than the beginning.
In the beginning, the poet is using either neutral or not so strong words as in the end of the sonnet - there he shows the full emotion he is feeling, by using words such as enthrall, never be free, ravish, etc. I believe that conveys a much stronger message than the beginning.