What is the main difference between airports of the early 1920s and international airports of the 1930s? A. Airports in the early 1920s catered to municipal and regional travel, while airports in the 1930s served as hubs for travel between countries. B. Airports in the early 1920s had larger runways and airport space, while airports of the 1930s had smaller, more efficient layouts. C. Airports in the early 1920s catered to travel between countries, while airports in the 1930s served as hubs for regional and municipal travel. D. Airports in the early 1920s were located in West Coast cities, while airports in the 1930s were located in East Coast cities.