Analysis:
The question asks who believes Greek and Latin should not be school subjects. We need to find the person who expresses this view.
- Oskar: Doesn't mention Greek or Latin in relation to being school subjects.
- Mary: Says, "However, there are some subjects I don't think we should learn at school. Greek and Latin can be interesting, but I think that you should study them at university because they are difficult and many students my age find them boring."
- Freeda: Argues that classical languages are important and can help.
Mary explicitly states that she doesn't think Greek and Latin should be learned at school.
Answer: Mary