The major details that this short excerpt explained were all connected with the negative consequences of divorce. The first sentence might even give it away because it says "Divorce has serious negative consequences". All things being discussed relate to the negativities that occur after a divorce. Although it may seem as though d) may be the answer, that only talks about a certain part of the passage and not the overrall argument.
The main themes in "A Very Old Man with Enormous Wings" are doubt, ambiguity, and the problem of interpretation. Doubt and ambiguity: A variety of theories about the old man are presented: some believe he's an angel, while others view him as a member of a new race.
I can’t see the stanza, but generally, alliteration can help add mood and sometimes tone to the writing. The repetitiveness can add a cadence to the poem.