I chose (D) over (E). Here is my thought process:
Antonia would disagree with (D) since she states that "the stock market is the BEST place to invest money" whereas Maria would agree with (D) since she basically states that "it is better to invest in saving bonds than stock market". So I don't see why (D) would be wrong.
If (D) is wrong because we can't infer what Antonia thinks of saving bonds since she doesn't mention about it -- then I think (E) would be wrong too since she doesn't mention anything about "picking an investment offering a reliable income". Do you see my point?
Or is (D) wrong because of the word "safer"? Because Antonia just says that the stock market is the "best place" not the "safest", whereas "safer" is implied in Maria's argument. I don't get it.. I seem to have a lot of trouble with these point at issue questions for some reason. Am I inferring too much?