Final answer:
The reader should change from a descriptive tone to one that is inquisitive or reflective, most likely sounding excited, aligning with the poem's shift towards awe and wonder.
Step-by-step explanation:
Regarding the question about how a reader should change tone to match the events between the first and second half of a stanza in William Butler Yeats's The Song of Wandering Aengus, let's focus on the tonal shift that occurs. Initially, the poem has a descriptive tone, which invites readers into the narrative. As the poem progresses, the tone becomes more inquisitive and reflective, not angry, sad, or intimidating. Therefore, the most suitable answer would be either a shift towards a more excited or introspective tone. Considering the emotional trajectory and metaphoric language in the poem, a shift from descriptive to excited could be warranted as the poem reflects awe and wonder at the end, thus option c) seems most appropriate.