Well, it could either be metaphor for something (I'm not sure, I haven't read the poem) or 'alliteration', because G is repeated often. The rest of the options aren't possible, because there is nothing ironic here, nor is there a simile, or a metonymy.
At the end of Chapter 3, Kino rejects Juana's fears that the pearl will destroy them. He silences her and even acts aggressively. Kino seems to be under the spell of the pearl and views it as his one chance for a brighter future. His reaction to Juana's pleas reveals Kino as a proud and stubborn man.
The answer is me. Would you like Fred and me to leave for lunch now? Because if you were to say this without Fred you would say, "Would you like me to leave for lunch now" rather than, "Would you like myself to leave for lunch now". So your correct answer is me. Saying myself sounds awkward and is not the correct terminology for this phrase.
I hope this helps!