Answer:
C)The girl was one of those pretty and charming young creatures who sometimes are born, as if by a slip of fate, into a family of clerks.
D)She dressed plainly because she could not dress well, but she was unhappy as if she had really fallen from a higher station.
Step-by-step explanation:
Ironic tone is a resource, which aims to use words that manifest the opposite sense of their literal context. That is, to be ironic is to state exactly the opposite of what one thinks. The idea is to value something or someone when, in fact, the implicit meaning is of devaluation. This is what the author does when he uses the excerpts in letters C and D.