Junior describes himself as having an enormous skull and being so skinny that when he turned sideways he'd disappear. He is over exaggerating his features to get sympathy from the reader and to create humor. A hyperbole is an over exaggeration.
Now, people have to sneak across the border a lot more and are immigrating for a better life. But, 100 years ago, the regulations weren't as harsh and people were escaping their country for survival/
B.<span>The author wants to carry the theme of perseverance beyond the scope of the narrative by illustrating it to readers in a separate setting. </span>