What humor does lincoln include in this section of the primary source?

(we reached our new home about the time the state came in the union. it was a wild region, with many bears and other wild animals still in the woods. there i grew up. there were some schools, so called; but no qualification was ever required of a teacher, beyond "readin, writin, and cipherin.")

a. he compares his classmates to “bears and other wild animals.”
b. like his friends, lincoln joked around a lot in school instead of going to classes.
c. lincoln uses sarcasm to describe the quality of the schools where he grew up.
d. lincoln uses hyperbole to exaggerate the difficulty of his education