Answer:
The options available were:
A. More demographics
B. Faster growth, with less saturation
C. Wealthier consumers
D. Better technology and communication
I believe the best answer is B) Faster growth, with less saturation.
The US economy is the largest in the world, and very few foreign markets are larger: China, India and the European Union. The European Union is larger and has a lot of similarities with the American market: consolidated market with wealthy consumers.
While Chinese and Indian markets are much larger, their consumers are much poorer. But they do have an advantage, their markets are growing at a very rapid and steady rate.
Comparison can be tricky though. It is simple, if a Chinese spends $5,000 a year and next year he spends spends $5,500, his total expenses grew by 10%. While an American consumer spends $30,000 a year and if next year he spends $30,500, consumption has barely grown. A small market can grow a lot by only increasing expenses a little bit.