A、On every continent but not in every country. B、On the continents with developed countries. C、On the continents with developing

Have you planned for your next vacation? There are many destinations to choose from, both stateside and internationally. First, perhaps you need to decide on a climate, or if weather doesn’t bother you, then where is that one place that you would like to go?
     (19)If you go to central or South America, then you can see thriving cultures set against what are still considered to be wild and uninhabited. You can see something fairly similar in South Africa but with a whole different culture and with an extremely different kind of wild. Perhaps the bustling cities of northern Africa, sometimes called the Middle East, are more to your taste, if you like to live close to the edge. What about the ancient cultures mixed with cutting edge technology in parts of Asia? Then you have Europe, with some of the most traveled areas in the world.
    Each area does bring a totally different perspective in so that within each general area there are more specific areas.(20)If you are looking for something as vague as someplace with a small population and minimal inhabitation, then you can look at parts of Australia, Asia, Canada, South America, South Africa, northern Europe and Russia.
     (21)If you want bustling cities, then you have your pick of many on every continent and just about every country. It is probably safe to say that most people have an idea of where they want to go, but if you don’t, take a look around—there are literally millions of places.
19. What do we know about South America and South Africa?
20. Which places have a small population and minimal inhabitation?
21. Where can we find bustling cities?