Final answer:
The stanza uses a simile to compare the speaker's feelings about immigrating to the emotions of swimmers before they plunge into water, reflecting both eagerness and fear of the unknown.
Step-by-step explanation:
The stanza from Julia Alvarez's poem 'Exile' utilizes a simile as the literary device to compare the speaker's feelings about the new country to the feelings of two swimmers.
In lines B and D, 'like, Papi, two swimmers looking down at the quiet surface of our island waters,' the use of 'like' indicates a direct comparison, which is characteristic of a simile. This comparison conveys feelings of anticipation and apprehension towards the unknown, similar to swimmers about to dive into water, unsure of what they will encounter beneath the surface.