Which of the Following Might Be a Reason for Higher

Which of the following might be a reason for higher return potential in certain foreign stock markets than in U.S. markets?

A) Some small economies have more growth potential because they are starting from a smaller base of GDP
B) GDP is growing at a faster rate in some countries than in the United States
C) Many of these foreign economies have older populations that spend a higher percentage of their income than the U.S. population
D) A and B are valid reasons