Well with not having knowledge of what the specific poem is I can not suggest anything..
The <span>complex sentence that contains a dependent adverbial clause among the choices given is:
</span>C. Mark expects the photo to arrive when the letter arrives.
As the name suggests, adverbial clause is introduced by an adverb. This clause answers the question "when" which indicates the time the action happens.
The purpose of alliteration in this sentence is to make the 'slogan' stick in people's minds. This person is trying to make coin collecting sound like a fun activity that people will want to do, and using alliteration like this will have them easily remember the slogan long after they've read it.
He wishes for beautiful blue eyes
D. Future would be my best answer for the sentence provided