D, notice how the first 3 answers are alike! They are all personal where as the 4th is more of a statement not made personally
"Brennan on the Moor" is structured in this way, so that the longer stanzas can follow the tale of Brennan and give more details to the story. The shorter stanzas act as a chorus, which is usually used to come back to the main idea of a song or poem (in this case, the idea that Brennan is the hero of the poem).
The correct answer is C) Microphone. Hope this helps.