Which of the following conclusions can be drawn about the map

South America’s arable land is more affected by desertification than land on any other continent.
The Midwestern and Western United States appear to be suitable for growing crops.
Food production is most likely to decline in Africa and the Middle East as a result of desertification.
The vulnerability of desertification increases as land moves farther away from the equator.
I and II
I and III
II and III
II and IV
III and IV