Which of the Following Statements Best Characterizes the United States

Which of the following statements best characterizes the United States' population relative to that of other industrialized countries?

A) Much like other industrialized countries, the age profile of the United States' population has remained fairly constant over time.
B) The United States' population is aging and has always been older than citizens of most industrialized countries.
C) Although the population of the United States is becoming younger, Americans tend to be older than citizens of most industrialized countries.
D) Although the population of the United States is aging, Americans tend to be younger than citizens of most industrialized countries.