Aruba: Still a part of the Netherlands Antilles (despite defunct, Aruba isn't considered a country)
Zaire: Go back to the 20th century
Burma is what the country was originally called before military rule, and many still call it that today, partially in support of the Burmese democracy movement. Also, the US and UK (according to the BBC) still officially call it Burma, even though the UN calls it Myanmar.
I got this info from searching "Should it be Burma or Myanmar?" on the BBC's website.
But like I say, I'm just saying what I would have done, not criticizing the quizmaster's decisions.
Anyway, Burma had been used for centuries before 1948, when Burma got independence. The military there changed the name to Myanmar, but many countries still call it Burma. Jetpunk agrees with it being called Burma. Many Burmese call themselves Burmese, and it is still the official title. Honestly, I'd rather be called Burmese than the alternative, Myanmese.