The first thing to identify in the answer will be which phrases are alliterative. It's important to understand that<em> alliteration is the use in poetry of the same sound or sounds especially consonants at the beginning</em>, with that idea in mind now we can move forward to understand what "mood of awe" is.
In a piece of literature mood, <em>it's a general atmosphere or emotional complexion. </em>So a piece of literature as a poem can evoke in the reader's mind some feelings and thoughts. This is a tool that author's use especially with the word choice, tone, setting and diction in his or her writing. In this case every aspect of writing influence the mood.
When we are talking about <em>"mood of awe" </em>we can say that is <em>the atmosphere of a strong feeling of respect and amazement brought on by something sacred or beautiful. </em>Then the correct answer is "In all his tuneful turning..." this phrase is an alliteration because of the words <em>"tuneful"</em> and <em>"turning"</em> then when we read it we can see a change but in a very virtuous mood. In this case, the word "tuneful" is charged with a beautiful meaning and that contributes to an awe atmosphere.
It's not the phrase <em>"Filed high as the house" </em>because it doesn't evoke a feeling of respect, it's a description of an important scenario. About the second phrase: <em>"And honored among foxes and pheasants by the day house" </em> we can cross it out because it's not an example of alliteration. Finally in the final phrase<em> "And wake to the farm forever fled from the childless land."</em> the mood is going towards the feeling of missing the good days in a place where you were happy as a kid.
