Part A:
The best choice that describes how the structure of the poem conveys the author's metaphor is:
A. The back and forth between happiness and sadness reflects the speaker's energy level and ability to connect to others.
Part B:
The line from the text that best supports the correct answer to Part A is:
B. The swell of connection carries me through my morning on a high tide of bliss.
This line illustrates the metaphor of rising emotions and connection during the morning, while the structure shows the shifts in the speaker's experience throughout the day.