In "only daughter," which passage is an example of irony?

a. being an only daughter in a family of six sons forced me by circumstance to spend a lot of time by myself because my brother felt it beneath them to play with a girl in public.
b. i went upstairs to my father's room. one of my stories had just been translated into spanish and published in an anthology of chicano writing and i wanted to show it to him.
c. in retrospect, i'm lucky my father believed daughters were meant for husbands. it meant it didn't matter if i majored in something silly like english.
d. we'd have to let go of our flat, store the furniture with mother's relatives, load the station wagon with baggage and bologna sandwiches and head south. to mexico city.