"And look here—you drop that school, you hear? I'll learn people to bring up a boy to put on airs over his own father and let on to be better'n what HE is" is an example of irony.
Option ‘c’
Explanation :
The statement is quite ironic coming from a father. Fathers are generally expected to think of a bright future for his kid.
Here the father is telling his son to leave the school as it has been his perception, all gathered from people in society, that if he goes to school and learns, he will turn into a snob, arrogant and carrying an attitude which will let him have no respect for his father. Irony is a contradiction to what is expected.