The correct prediction is III only. More than half of the United States population will live in suburban areas, since the trend in 1990 reached 46%, with an approximate growth of 2% every 10 years, so if this growth is maintained, it would reach more than 50% of the population living in suburban areas by 2020.
Regarding point I, there is no data about how many people live near an Interstate Highway, so there is no possible comparison.
Regarding point II, the percentage of the population living in urban areas has remained constant, with a variation between 30-32%, so there is no indication that it would go down to 25% or less.